From 5a5e277b486bb95066cc3d6b38f6009a864df400 Mon Sep 17 00:00:00 2001
From: Ryo Aoyama <r.fe51028.r@gmail.com>
Date: Tue, 2 Oct 2018 13:49:03 +0900
Subject: [PATCH 01/11] Add utility computed property for Changeset

---
 Sources/Changeset.swift   | 55 +++++++++++++++++++++++++++------------
 Tests/ChangesetTest.swift | 22 ++++++++++++++++
 2 files changed, 60 insertions(+), 17 deletions(-)

diff --git a/Sources/Changeset.swift b/Sources/Changeset.swift
index 1563ca0..0388fa0 100644
--- a/Sources/Changeset.swift
+++ b/Sources/Changeset.swift
@@ -26,23 +26,6 @@ public struct Changeset<Collection: Swift.Collection> {
     /// The pairs of source and target path of moved elements.
     public var elementMoved: [(source: ElementPath, target: ElementPath)]
 
-    /// The number of all changes.
-    public var changeCount: Int {
-        return sectionDeleted.count
-            + sectionInserted.count
-            + sectionUpdated.count
-            + sectionMoved.count
-            + elementDeleted.count
-            + elementInserted.count
-            + elementUpdated.count
-            + elementMoved.count
-    }
-
-    /// A Boolean value indicating whether has changes.
-    public var hasChanges: Bool {
-        return changeCount > 0
-    }
-
     /// Creates a new `Changeset`.
     ///
     /// - Parameters:
@@ -78,6 +61,44 @@ public struct Changeset<Collection: Swift.Collection> {
     }
 }
 
+public extension Changeset {
+    /// The number of section changes.
+    public var sectionChangeCount: Int {
+        return sectionDeleted.count
+            + sectionInserted.count
+            + sectionUpdated.count
+            + sectionMoved.count
+    }
+
+    /// The number of element changes.
+    public var elementChangeCount: Int {
+        return elementDeleted.count
+            + elementInserted.count
+            + elementUpdated.count
+            + elementMoved.count
+    }
+
+    /// The number of all changes.
+    public var changeCount: Int {
+        return sectionChangeCount + elementChangeCount
+    }
+
+    /// A Boolean value indicating whether has section changes.
+    public var hasSectionChanges: Bool {
+        return sectionChangeCount > 0
+    }
+
+    /// A Boolean value indicating whether has element changes.
+    public var hasElementChanges: Bool {
+        return elementChangeCount > 0
+    }
+
+    /// A Boolean value indicating whether has changes.
+    public var hasChanges: Bool {
+        return changeCount > 0
+    }
+}
+
 extension Changeset: Equatable where Collection: Equatable {
     public static func == (lhs: Changeset, rhs: Changeset) -> Bool {
         return lhs.data == rhs.data
diff --git a/Tests/ChangesetTest.swift b/Tests/ChangesetTest.swift
index b8632ad..15c20f4 100644
--- a/Tests/ChangesetTest.swift
+++ b/Tests/ChangesetTest.swift
@@ -4,39 +4,55 @@ import DifferenceKit
 final class ChangesetTestCase: XCTestCase {
     func testchangeCount() {
         let c1 = Changeset(data: [()], sectionDeleted: [0, 1])
+        XCTAssertEqual(c1.sectionChangeCount, 2)
+        XCTAssertEqual(c1.elementChangeCount, 0)
         XCTAssertEqual(c1.changeCount, 2)
 
         let c2 = Changeset(data: [()], sectionInserted: [0, 1, 2])
+        XCTAssertEqual(c2.sectionChangeCount, 3)
+        XCTAssertEqual(c2.elementChangeCount, 0)
         XCTAssertEqual(c2.changeCount, 3)
 
         let c3 = Changeset(data: [()], sectionUpdated: [0, 1, 2, 3])
+        XCTAssertEqual(c3.sectionChangeCount, 4)
+        XCTAssertEqual(c3.elementChangeCount, 0)
         XCTAssertEqual(c3.changeCount, 4)
 
         let c4 = Changeset(data: [()], sectionMoved: [(source: 0, target: 1)])
+        XCTAssertEqual(c4.sectionChangeCount, 1)
+        XCTAssertEqual(c4.elementChangeCount, 0)
         XCTAssertEqual(c4.changeCount, 1)
 
         let c5 = Changeset(
             data: [()],
             elementDeleted: [ElementPath(element: 0, section: 0), ElementPath(element: 1, section: 1)]
         )
+        XCTAssertEqual(c5.sectionChangeCount, 0)
+        XCTAssertEqual(c5.elementChangeCount, 2)
         XCTAssertEqual(c5.changeCount, 2)
 
         let c6 = Changeset(
             data: [()],
             elementInserted: [ElementPath(element: 0, section: 0), ElementPath(element: 1, section: 1)]
         )
+        XCTAssertEqual(c6.sectionChangeCount, 0)
+        XCTAssertEqual(c6.elementChangeCount, 2)
         XCTAssertEqual(c6.changeCount, 2)
 
         let c7 = Changeset(
             data: [()],
             elementUpdated: [ElementPath(element: 0, section: 0), ElementPath(element: 1, section: 1)]
         )
+        XCTAssertEqual(c7.sectionChangeCount, 0)
+        XCTAssertEqual(c7.elementChangeCount, 2)
         XCTAssertEqual(c7.changeCount, 2)
 
         let c8 = Changeset(
             data: [()],
             elementMoved: [(source: ElementPath(element: 0, section: 0), target: ElementPath(element: 1, section: 1))]
         )
+        XCTAssertEqual(c8.sectionChangeCount, 0)
+        XCTAssertEqual(c8.elementChangeCount, 1)
         XCTAssertEqual(c8.changeCount, 1)
 
         let c9 = Changeset(
@@ -50,14 +66,20 @@ final class ChangesetTestCase: XCTestCase {
             elementUpdated: [ElementPath(element: 9, section: 10)],
             elementMoved: [(source: ElementPath(element: 11, section: 12), target: ElementPath(element: 13, section: 14))]
         )
+        XCTAssertEqual(c9.sectionChangeCount, 4)
+        XCTAssertEqual(c9.elementChangeCount, 4)
         XCTAssertEqual(c9.changeCount, 8)
     }
 
     func testHasChanges() {
         let c1 = Changeset(data: [()])
+        XCTAssertFalse(c1.hasSectionChanges)
+        XCTAssertFalse(c1.hasElementChanges)
         XCTAssertFalse(c1.hasChanges)
 
         let c2 = Changeset(data: [()], sectionDeleted: [0])
+        XCTAssertTrue(c2.hasSectionChanges)
+        XCTAssertFalse(c2.hasElementChanges)
         XCTAssertTrue(c2.hasChanges)
     }
 

From 0b5aaf1356e7db0b0e94c079865a118536f08360 Mon Sep 17 00:00:00 2001
From: Ryo Aoyama <r.fe51028.r@gmail.com>
Date: Tue, 2 Oct 2018 13:58:16 +0900
Subject: [PATCH 02/11] Add ContentEquatable

---
 DifferenceKit.xcodeproj/project.pbxproj |  4 ++++
 Sources/ContentEquatable.swift          | 26 +++++++++++++++++++++++
 Sources/Differentiable.swift            | 28 ++-----------------------
 3 files changed, 32 insertions(+), 26 deletions(-)
 create mode 100644 Sources/ContentEquatable.swift

diff --git a/DifferenceKit.xcodeproj/project.pbxproj b/DifferenceKit.xcodeproj/project.pbxproj
index 4384718..f7b8448 100644
--- a/DifferenceKit.xcodeproj/project.pbxproj
+++ b/DifferenceKit.xcodeproj/project.pbxproj
@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		6B2DF878210E2C12004D2D40 /* DifferenceKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 6B2DF86E210E2C12004D2D40 /* DifferenceKit.framework */; };
+		6B444B392163312700AEE32B /* ContentEquatable.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B444B382163312700AEE32B /* ContentEquatable.swift */; };
 		6B5B409C211066BF00A931DB /* AlgorithmTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B5B4093211066BF00A931DB /* AlgorithmTest.swift */; };
 		6B5B409D211066BF00A931DB /* ArraySectionTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B5B4094211066BF00A931DB /* ArraySectionTest.swift */; };
 		6B5B409E211066BF00A931DB /* StagedChangesetTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B5B4095211066BF00A931DB /* StagedChangesetTest.swift */; };
@@ -42,6 +43,7 @@
 		6B2DF86E210E2C12004D2D40 /* DifferenceKit.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = DifferenceKit.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		6B2DF877210E2C12004D2D40 /* Tests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = Tests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		6B2DF88A210E39A8004D2D40 /* DifferenceKit.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; path = DifferenceKit.xcconfig; sourceTree = "<group>"; };
+		6B444B382163312700AEE32B /* ContentEquatable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentEquatable.swift; sourceTree = "<group>"; };
 		6B5B4086211066B300A931DB /* Algorithm.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Algorithm.swift; sourceTree = "<group>"; };
 		6B5B4088211066B300A931DB /* UIKitExtension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIKitExtension.swift; sourceTree = "<group>"; };
 		6B5B408A211066B300A931DB /* ArraySection.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ArraySection.swift; sourceTree = "<group>"; };
@@ -117,6 +119,7 @@
 				6B5B4086211066B300A931DB /* Algorithm.swift */,
 				6B5B408F211066B300A931DB /* Changeset.swift */,
 				6B5B408C211066B300A931DB /* StagedChangeset.swift */,
+				6B444B382163312700AEE32B /* ContentEquatable.swift */,
 				6B5B4091211066B300A931DB /* Differentiable.swift */,
 				6B5B408E211066B300A931DB /* DifferentiableSection.swift */,
 				6B5B408B211066B300A931DB /* AnyDifferentiable.swift */,
@@ -261,6 +264,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				6B444B392163312700AEE32B /* ContentEquatable.swift in Sources */,
 				6B5B40A8211066EA00A931DB /* Changeset.swift in Sources */,
 				6B5B40AB211066EA00A931DB /* AnyDifferentiable.swift in Sources */,
 				755D649621514ECB0049A3C5 /* AppKitExtension.swift in Sources */,
diff --git a/Sources/ContentEquatable.swift b/Sources/ContentEquatable.swift
new file mode 100644
index 0000000..b38fddc
--- /dev/null
+++ b/Sources/ContentEquatable.swift
@@ -0,0 +1,26 @@
+/// Represents a value that can compare whether the content are equal.
+public protocol ContentEquatable {
+    /// Indicate whether the content of `self` is equals to the content of
+    /// the given source value.
+    ///
+    /// - Parameters:
+    ///   - source: A source value to be compared.
+    ///
+    /// - Returns: A Boolean value indicating whether the content of `self` is equals
+    ///            to the content of the given source value.
+    func isContentEqual(to source: Self) -> Bool
+}
+
+public extension ContentEquatable where Self: Equatable {
+    /// Indicate whether the content of `self` is equals to the content of the given source value.
+    /// Updates are compared using `==` operator of `Equatable'.
+    ///
+    /// - Parameters:
+    ///   - source: A source value to be compared.
+    ///
+    /// - Returns: A Boolean value indicating whether the content of `self` is equals
+    ///            to the content of the given source value.
+    func isContentEqual(to source: Self) -> Bool {
+        return self == source
+    }
+}
diff --git a/Sources/Differentiable.swift b/Sources/Differentiable.swift
index 1079666..e52bf68 100644
--- a/Sources/Differentiable.swift
+++ b/Sources/Differentiable.swift
@@ -1,34 +1,10 @@
-/// Represents the value that identified and can be compared to whether has updated.
-public protocol Differentiable {
+/// Represents the value that identified for differentiate.
+public protocol Differentiable: ContentEquatable {
     /// A type representing the identifier.
     associatedtype DifferenceIdentifier: Hashable
 
     /// An identifier value for difference calculation.
     var differenceIdentifier: DifferenceIdentifier { get }
-
-    /// Indicate whether the content of `self` is equals to the content of
-    /// the given source value.
-    ///
-    /// - Parameters:
-    ///   - source: A source value to be compared.
-    ///
-    /// - Returns: A Boolean value indicating whether the content of `self` is equals
-    ///            to the content of the given source value.
-    func isContentEqual(to source: Self) -> Bool
-}
-
-public extension Differentiable where Self: Equatable {
-    /// Indicate whether the content of `self` is equals to the content of the given source value.
-    /// Updates are compared using `==` operator of `Equatable'.
-    ///
-    /// - Parameters:
-    ///   - source: A source value to be compared.
-    ///
-    /// - Returns: A Boolean value indicating whether the content of `self` is equals
-    ///            to the content of the given source value.
-    func isContentEqual(to source: Self) -> Bool {
-        return self == source
-    }
 }
 
 public extension Differentiable where Self: Hashable {

From c5bd0f72c317fc8acb2c6e4f50ed0ee54f522efe Mon Sep 17 00:00:00 2001
From: Ryo Aoyama <r.fe51028.r@gmail.com>
Date: Tue, 2 Oct 2018 15:59:14 +0900
Subject: [PATCH 03/11] Inlining

---
 Sources/Algorithm.swift         | 93 ++++++++++++++++++++++-----------
 Sources/AnyDifferentiable.swift | 63 ++++++++++++++++++----
 Sources/ArraySection.swift      |  9 ++--
 Sources/Changeset.swift         |  7 +++
 Sources/ContentEquatable.swift  |  1 +
 Sources/Differentiable.swift    |  1 +
 Sources/ElementPath.swift       |  2 +-
 Sources/StagedChangeset.swift   | 12 ++++-
 8 files changed, 140 insertions(+), 48 deletions(-)

diff --git a/Sources/Algorithm.swift b/Sources/Algorithm.swift
index 905d7b0..624b6cc 100644
--- a/Sources/Algorithm.swift
+++ b/Sources/Algorithm.swift
@@ -18,6 +18,7 @@ public extension StagedChangeset where Collection: RangeReplaceableCollection, C
     ///   - target: A target collection to calculate differences.
     ///
     /// - Complexity: O(n)
+    @inlinable
     public init(source: Collection, target: Collection) {
         self.init(source: source, target: target, section: 0)
     }
@@ -42,6 +43,7 @@ public extension StagedChangeset where Collection: RangeReplaceableCollection, C
     ///   - section: An Int value to use as section index (or offset) of element.
     ///
     /// - Complexity: O(n)
+    @inlinable
     public init(source: Collection, target: Collection, section: Int) {
         let sourceElements = ContiguousArray(source)
         let targetElements = ContiguousArray(target)
@@ -134,6 +136,7 @@ public extension StagedChangeset where Collection: RangeReplaceableCollection, C
     ///   - target: A target sectioned collection to calculate differences.
     ///
     /// - Complexity: O(n)
+    @inlinable
     public init(source: Collection, target: Collection) {
         typealias Section = Collection.Element
         typealias SectionIdentifier = Collection.Element.DifferenceIdentifier
@@ -405,8 +408,9 @@ public extension StagedChangeset where Collection: RangeReplaceableCollection, C
 }
 
 /// The shared algorithm to calculate differences between two linear collections.
+@inlinable
 @discardableResult
-private func differentiate<E: Differentiable, I>(
+internal func differentiate<E: Differentiable, I>(
     source: ContiguousArray<E>,
     target: ContiguousArray<E>,
     trackTargetIndexAsUpdated: Bool,
@@ -528,16 +532,23 @@ private func differentiate<E: Differentiable, I>(
 }
 
 /// A set of changes and metadata as a result of calculating differences in linear collection.
-private struct DifferentiateResult<Index> {
-    typealias Metadata = (sourceTraces: ContiguousArray<Trace<Int>>, targetReferences: ContiguousArray<Int?>)
-
-    let deleted: [Index]
-    let inserted: [Index]
-    let updated: [Index]
-    let moved: [(source: Index, target: Index)]
-    let metadata: Metadata
-
-    init(
+@usableFromInline
+internal struct DifferentiateResult<Index> {
+    @usableFromInline
+    internal typealias Metadata = (sourceTraces: ContiguousArray<Trace<Int>>, targetReferences: ContiguousArray<Int?>)
+    @usableFromInline
+    internal let deleted: [Index]
+    @usableFromInline
+    internal let inserted: [Index]
+    @usableFromInline
+    internal let updated: [Index]
+    @usableFromInline
+    internal let moved: [(source: Index, target: Index)]
+    @usableFromInline
+    internal let metadata: Metadata
+
+    @inlinable
+    internal init(
         deleted: [Index] = [],
         inserted: [Index] = [],
         updated: [Index] = [],
@@ -553,32 +564,46 @@ private struct DifferentiateResult<Index> {
 }
 
 /// A set of informations in middle of difference calculation.
-private struct Trace<Index> {
-    var reference: Index?
-    var deleteOffset = 0
-    var isTracked = false
+@usableFromInline
+internal struct Trace<Index> {
+    @usableFromInline
+    internal var reference: Index?
+    @usableFromInline
+    internal var deleteOffset = 0
+    @usableFromInline
+    internal var isTracked = false
+
+    @inlinable
+    init() {}
 }
 
 /// The occurrences of element.
-private enum Occurrence {
+@usableFromInline
+internal enum Occurrence {
     case unique(index: Int)
     case duplicate(reference: IndicesReference)
 }
 
 /// A mutable reference to indices of elements.
-private final class IndicesReference {
-    private var indices: ContiguousArray<Int>
-    private var position = 0
-
-    init(_ indices: ContiguousArray<Int>) {
+@usableFromInline
+internal final class IndicesReference {
+    @usableFromInline
+    internal var indices: ContiguousArray<Int>
+    @usableFromInline
+    internal var position = 0
+
+    @inlinable
+    internal init(_ indices: ContiguousArray<Int>) {
         self.indices = indices
     }
 
-    func push(_ index: Int) {
+    @inlinable
+    internal func push(_ index: Int) {
         indices.append(index)
     }
 
-    func next() -> Int? {
+    @inlinable
+    internal func next() -> Int? {
         guard position < indices.endIndex else {
             return nil
         }
@@ -588,23 +613,29 @@ private final class IndicesReference {
 }
 
 /// Dictionary key using UnsafePointer for performance optimization.
-private struct TableKey<T: Hashable>: Hashable {
-    let hashValue: Int
-    private let pointer: UnsafePointer<T>
-
-    init(pointer: UnsafePointer<T>) {
+@usableFromInline
+internal struct TableKey<T: Hashable>: Hashable {
+    @usableFromInline
+    internal let hashValue: Int
+    @usableFromInline
+    internal let pointer: UnsafePointer<T>
+
+    @inlinable
+    internal init(pointer: UnsafePointer<T>) {
         self.hashValue = pointer.pointee.hashValue
         self.pointer = pointer
     }
 
-    static func == (lhs: TableKey, rhs: TableKey) -> Bool {
+    @inlinable
+    internal static func == (lhs: TableKey, rhs: TableKey) -> Bool {
         return lhs.hashValue == rhs.hashValue
             && (lhs.pointer.distance(to: rhs.pointer) == 0 || lhs.pointer.pointee == rhs.pointer.pointee)
     }
 }
 
-private extension MutableCollection where Element: MutableCollection, Index == Int, Element.Index == Int {
-    subscript(path: ElementPath) -> Element.Element {
+internal extension MutableCollection where Element: MutableCollection, Index == Int, Element.Index == Int {
+    @inlinable
+    internal subscript(path: ElementPath) -> Element.Element {
         get { return self[path.section][path.element] }
         set { self[path.section][path.element] = newValue }
     }
diff --git a/Sources/AnyDifferentiable.swift b/Sources/AnyDifferentiable.swift
index 343c560..75b4492 100644
--- a/Sources/AnyDifferentiable.swift
+++ b/Sources/AnyDifferentiable.swift
@@ -24,24 +24,27 @@
 ///     print(changeset.isEmpty)  // prints "false"
 public struct AnyDifferentiable: Differentiable {
     /// The value wrapped by this instance.
-    public let base: Any
+    @inlinable
+    public var base: Any {
+        return box.base
+    }
+
     /// A type-erased identifier value for difference calculation.
-    public let differenceIdentifier: AnyHashable
+    @inlinable
+    public var differenceIdentifier: AnyHashable {
+        return box.differenceIdentifier
+    }
 
-    private let isContentEqualTo: (AnyDifferentiable) -> Bool
+    @usableFromInline
+    internal let box: AnyDifferentiableBox
 
     /// Creates a type-erased differentiable value that wraps the given instance.
     ///
     /// - Parameters:
     ///   - base: A differentiable value to wrap.
+    @inlinable
     public init<D: Differentiable>(_ base: D) {
-        self.base = base
-        self.differenceIdentifier = AnyHashable(base.differenceIdentifier)
-
-        self.isContentEqualTo = { source in
-            guard let sourceBase = source.base as? D else { return false }
-            return base.isContentEqual(to: sourceBase)
-        }
+        box = ConcretDifferentiableBox(base)
     }
 
     /// Indicate whether the content of `base` is equals to the content of the given source value.
@@ -51,8 +54,9 @@ public struct AnyDifferentiable: Differentiable {
     ///
     /// - Returns: A Boolean value indicating whether the content of `base` is equals
     ///            to the content of `base` of the given source value.
+    @inlinable
     public func isContentEqual(to source: AnyDifferentiable) -> Bool {
-        return isContentEqualTo(source)
+        return box.isContentEqual(to: source.box)
     }
 }
 
@@ -61,3 +65,40 @@ extension AnyDifferentiable: CustomDebugStringConvertible {
         return "AnyDifferentiable(\(String(reflecting: base))"
     }
 }
+
+@usableFromInline
+internal protocol AnyDifferentiableBox {
+    var base: Any { get }
+    var differenceIdentifier: AnyHashable { get }
+
+    func isContentEqual(to source: AnyDifferentiableBox) -> Bool
+}
+
+@usableFromInline
+internal struct ConcretDifferentiableBox<Base: Differentiable>: AnyDifferentiableBox {
+    @usableFromInline
+    internal let baseComponent: Base
+
+    @inlinable
+    internal var base: Any {
+        return baseComponent
+    }
+
+    @inlinable
+    internal var differenceIdentifier: AnyHashable {
+        return AnyHashable(baseComponent.differenceIdentifier)
+    }
+
+    @inlinable
+    internal init(_ base: Base) {
+        baseComponent = base
+    }
+
+    @inlinable
+    internal func isContentEqual(to source: AnyDifferentiableBox) -> Bool {
+        guard let sourceBase = source.base as? Base else {
+            return false
+        }
+        return baseComponent.isContentEqual(to: sourceBase)
+    }
+}
diff --git a/Sources/ArraySection.swift b/Sources/ArraySection.swift
index c82931a..9716706 100644
--- a/Sources/ArraySection.swift
+++ b/Sources/ArraySection.swift
@@ -9,8 +9,9 @@ public struct ArraySection<Model: Differentiable, Element: Differentiable>: Diff
     public var elements: [Element]
 
     /// An identifier value that of model for difference calculation.
+    @inlinable
     public var differenceIdentifier: Model.DifferenceIdentifier {
-        @inline(__always) get { return model.differenceIdentifier }
+        return model.differenceIdentifier
     }
 
     /// Creates a section with the model and the elements.
@@ -18,7 +19,7 @@ public struct ArraySection<Model: Differentiable, Element: Differentiable>: Diff
     /// - Parameters:
     ///   - model: A differentiable model of section.
     ///   - elements: The collection of element in the section.
-    @inline(__always)
+    @inlinable
     public init<C: Collection>(model: Model, elements: C) where C.Element == Element {
         self.model = model
         self.elements = Array(elements)
@@ -29,7 +30,7 @@ public struct ArraySection<Model: Differentiable, Element: Differentiable>: Diff
     /// - Parameters:
     ///   - source: A source section to reproduce.
     ///   - elements: The collection of elements for the new section.
-    @inline(__always)
+    @inlinable
     public init<C: Collection>(source: ArraySection, elements: C) where C.Element == Element {
         self.init(model: source.model, elements: elements)
     }
@@ -44,7 +45,7 @@ public struct ArraySection<Model: Differentiable, Element: Differentiable>: Diff
     ///
     /// - Returns: A Boolean value indicating whether the content of `self` is equals
     ///            to the content of the given source section.
-    @inline(__always)
+    @inlinable
     public func isContentEqual(to source: ArraySection) -> Bool {
         return model.isContentEqual(to: source.model)
     }
diff --git a/Sources/Changeset.swift b/Sources/Changeset.swift
index 0388fa0..6c3d74e 100644
--- a/Sources/Changeset.swift
+++ b/Sources/Changeset.swift
@@ -38,6 +38,7 @@ public struct Changeset<Collection: Swift.Collection> {
     ///   - elementInserted: The paths of inserted elements.
     ///   - elementUpdated: The paths of updated elements.
     ///   - elementMoved: The pairs of source and target path of moved elements.
+    @inlinable
     public init(
         data: Collection,
         sectionDeleted: [Int] = [],
@@ -63,6 +64,7 @@ public struct Changeset<Collection: Swift.Collection> {
 
 public extension Changeset {
     /// The number of section changes.
+    @inlinable
     public var sectionChangeCount: Int {
         return sectionDeleted.count
             + sectionInserted.count
@@ -71,6 +73,7 @@ public extension Changeset {
     }
 
     /// The number of element changes.
+    @inlinable
     public var elementChangeCount: Int {
         return elementDeleted.count
             + elementInserted.count
@@ -79,21 +82,25 @@ public extension Changeset {
     }
 
     /// The number of all changes.
+    @inlinable
     public var changeCount: Int {
         return sectionChangeCount + elementChangeCount
     }
 
     /// A Boolean value indicating whether has section changes.
+    @inlinable
     public var hasSectionChanges: Bool {
         return sectionChangeCount > 0
     }
 
     /// A Boolean value indicating whether has element changes.
+    @inlinable
     public var hasElementChanges: Bool {
         return elementChangeCount > 0
     }
 
     /// A Boolean value indicating whether has changes.
+    @inlinable
     public var hasChanges: Bool {
         return changeCount > 0
     }
diff --git a/Sources/ContentEquatable.swift b/Sources/ContentEquatable.swift
index b38fddc..9032212 100644
--- a/Sources/ContentEquatable.swift
+++ b/Sources/ContentEquatable.swift
@@ -20,6 +20,7 @@ public extension ContentEquatable where Self: Equatable {
     ///
     /// - Returns: A Boolean value indicating whether the content of `self` is equals
     ///            to the content of the given source value.
+    @inlinable
     func isContentEqual(to source: Self) -> Bool {
         return self == source
     }
diff --git a/Sources/Differentiable.swift b/Sources/Differentiable.swift
index e52bf68..0610b24 100644
--- a/Sources/Differentiable.swift
+++ b/Sources/Differentiable.swift
@@ -9,6 +9,7 @@ public protocol Differentiable: ContentEquatable {
 
 public extension Differentiable where Self: Hashable {
     /// The `self` value as an identifier for difference calculation.
+    @inlinable
     var differenceIdentifier: Self {
         return self
     }
diff --git a/Sources/ElementPath.swift b/Sources/ElementPath.swift
index bd86b90..bbcaffa 100644
--- a/Sources/ElementPath.swift
+++ b/Sources/ElementPath.swift
@@ -12,7 +12,7 @@ public struct ElementPath: Hashable {
     /// - Parameters:
     ///   - element: The element index (or offset).
     ///   - section: The section index (or offset).
-    @inline(__always)
+    @inlinable
     public init(element: Int, section: Int) {
         self.element = element
         self.section = section
diff --git a/Sources/StagedChangeset.swift b/Sources/StagedChangeset.swift
index 9160930..a917203 100644
--- a/Sources/StagedChangeset.swift
+++ b/Sources/StagedChangeset.swift
@@ -30,51 +30,61 @@
 ///     let changeset = StagedChangeset(source: sectionedSource, target: sectionedTarget)
 ///     print(changeset.isEmpty)  // prints "false"
 public struct StagedChangeset<Collection: Swift.Collection> {
-    private var changesets: ContiguousArray<Changeset<Collection>>
+    @usableFromInline
+    internal var changesets: ContiguousArray<Changeset<Collection>>
 
     /// Creates a new `StagedChangeset`.
     ///
     /// - Parameters:
     ///   - changesets: The collection of `Changeset`.
+    @inlinable
     public init<C: Swift.Collection>(_ changesets: C) where C.Element == Changeset<Collection> {
         self.changesets = ContiguousArray(changesets)
     }
 }
 
 extension StagedChangeset: RandomAccessCollection, RangeReplaceableCollection, MutableCollection {
+    @inlinable
     public init() {
         self.init([])
     }
 
+    @inlinable
     public var startIndex: Int {
         return changesets.startIndex
     }
 
+    @inlinable
     public var endIndex: Int {
         return changesets.endIndex
     }
 
+    @inlinable
     public func index(after i: Int) -> Int {
         return changesets.index(after: i)
     }
 
+    @inlinable
     public subscript(position: Int) -> Changeset<Collection> {
         get { return changesets[position] }
         set { changesets[position] = newValue }
     }
 
+    @inlinable
     public mutating func replaceSubrange<C: Swift.Collection, R: RangeExpression>(_ subrange: R, with newElements: C) where C.Element == Changeset<Collection>, R.Bound == Int {
         changesets.replaceSubrange(subrange, with: newElements)
     }
 }
 
 extension StagedChangeset: Equatable where Collection: Equatable {
+    @inlinable
     public static func == (lhs: StagedChangeset, rhs: StagedChangeset) -> Bool {
         return lhs.changesets == rhs.changesets
     }
 }
 
 extension StagedChangeset: ExpressibleByArrayLiteral {
+    @inlinable
     public init(arrayLiteral elements: Changeset<Collection>...) {
         self.init(elements)
     }

From f4e05557069c290bc8a9251d129a05f463443cab Mon Sep 17 00:00:00 2001
From: Ryo Aoyama <r.fe51028.r@gmail.com>
Date: Tue, 2 Oct 2018 16:02:12 +0900
Subject: [PATCH 04/11] Swift4.2

---
 .swift-version                          | 2 +-
 .travis.yml                             | 6 ------
 DifferenceKit.xcodeproj/project.pbxproj | 4 ++--
 README.md                               | 4 ++--
 4 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/.swift-version b/.swift-version
index 7d5c902..bf77d54 100644
--- a/.swift-version
+++ b/.swift-version
@@ -1 +1 @@
-4.1
+4.2
diff --git a/.travis.yml b/.travis.yml
index f477c9b..a00abf8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,11 +12,5 @@ matrix:
         - xcodebuild build-for-testing test-without-building -scheme DifferenceKit -configuration Release -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 8' ENABLE_TESTABILITY=YES | xcpretty - c
         - xcodebuild build-for-testing test-without-building -scheme DifferenceKit -configuration Release -sdk appletvsimulator -destination 'platform=tvOS Simulator,name=Apple TV' ENABLE_TESTABILITY=YES | xcpretty -c
         - xcodebuild build -scheme DifferenceKit -configuration Release -sdk watchsimulator -destination 'platform=watchOS Simulator,name=Apple Watch - 38mm' ENABLE_TESTABILITY=YES | xcpretty -c
-    - os: osx
-      language: objective-c
-      osx_image: xcode9.4
-      script:
-        - xcodebuild build -scheme DifferenceKit -configuration Release ENABLE_TESTABILITY=YES | xcpretty -c
-        - xcodebuild build -scheme DifferenceKit -configuration Release -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 8' | xcpretty -c
 notifications:
   email: false
diff --git a/DifferenceKit.xcodeproj/project.pbxproj b/DifferenceKit.xcodeproj/project.pbxproj
index f7b8448..4cdfafd 100644
--- a/DifferenceKit.xcodeproj/project.pbxproj
+++ b/DifferenceKit.xcodeproj/project.pbxproj
@@ -362,7 +362,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -419,7 +419,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
diff --git a/README.md b/README.md
index f36ff8d..57fd28d 100644
--- a/README.md
+++ b/README.md
@@ -170,7 +170,7 @@ collectionView.reload(using: changeset, interrupt: { $0.changeCount > 100 }) { d
 
 ## Comparison with Other Frameworks
 Made a fair comparison as much as possible in features and performance with other **popular** and **awesome** frameworks.  
-⚠️ This does `NOT` determine superiority or inferiority of the frameworks. I know that each framework has different benefits.  
+This does **NOT** determine superiority or inferiority of the frameworks. I know that each framework has different benefits.  
 The frameworks and its version that compared is below.  
 
 - [DifferenceKit](https://github.com/ra1028/DifferenceKit) - master
@@ -268,7 +268,7 @@ Use `Foundation.UUID` as an element.
 ---
 
 ## Requirements
-- Swift4.1+
+- Swift4.2+
 - iOS 9.0+
 - tvOS 9.0+
 - OS X 10.9+

From 30189ea8e2e2961f29a8abdd09f5eaab63c5ed2c Mon Sep 17 00:00:00 2001
From: Ryo Aoyama <r.fe51028.r@gmail.com>
Date: Tue, 2 Oct 2018 16:47:24 +0900
Subject: [PATCH 05/11] Update README

---
 README.md | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/README.md b/README.md
index 57fd28d..1e97285 100644
--- a/README.md
+++ b/README.md
@@ -87,16 +87,14 @@ In the case of definition above, `id` uniquely identifies the element and get to
 
 There are default implementations of `Differentiable` for the types that conformed to `Equatable` or `Hashable`：
 ```swift
-public extension Differentiable where Self: Equatable {
-    func isContentEqual(to source: Self) -> Bool {
-        return self == source
-    }
+// If `Self` conform to `Hashable`.
+var differenceIdentifier: Self {
+    return self
 }
 
-public extension Differentiable where Self: Hashable {
-    var differenceIdentifier: Self {
-        return self
-    }
+// If `Self` conform to `Equatable`.
+func isContentEqual(to source: Self) -> Bool {
+    return self == source
 }
 ```
 So, you can simply:

From 6c5dcb8756dd2dc6ef2fbfb4062f56ca51e7ae3a Mon Sep 17 00:00:00 2001
From: Ryo Aoyama <r.fe51028.r@gmail.com>
Date: Tue, 2 Oct 2018 17:37:52 +0900
Subject: [PATCH 06/11] Update README

---
 README.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 1e97285..69b4090 100644
--- a/README.md
+++ b/README.md
@@ -230,7 +230,7 @@ Use `Foundation.UUID` as an element.
 #### - From 5,000 elements to 500 deleted and 500 inserted
 |             |Time(second)|
 |:------------|:-----------|
-|DifferenceKit|0.0032      |
+|DifferenceKit|0.0022      |
 |RxDataSources|0.0078      |
 |FlexibleDiff |0.0168      |
 |IGListKit    |0.0412      |
@@ -242,7 +242,7 @@ Use `Foundation.UUID` as an element.
 #### - From 10,000 elements to 1,000 deleted and 1,000 inserted
 |             |Time(second)|
 |:------------|:-----------|
-|DifferenceKit|0.0076      |
+|DifferenceKit|0.0049      |
 |RxDataSources|0.0143      |
 |FlexibleDiff |0.0305      |
 |IGListKit    |0.0891      |
@@ -254,7 +254,7 @@ Use `Foundation.UUID` as an element.
 #### - From 100,000 elements to 10,000 deleted and 10,000 inserted
 |             |Time(second)|
 |:------------|:-----------|
-|DifferenceKit|0.087       |
+|DifferenceKit|0.057       |
 |RxDataSources|0.179       |
 |FlexibleDiff |0.356       |
 |IGListKit    |1.329       |

From 62bd6402e6e846c1478b49b14a1afd9d5e424852 Mon Sep 17 00:00:00 2001
From: Ryo Aoyama <r.fe51028.r@gmail.com>
Date: Tue, 2 Oct 2018 17:41:10 +0900
Subject: [PATCH 07/11] Build with Swift4.1 on CI

---
 .travis.yml | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index a00abf8..a6c46ec 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,5 +12,11 @@ matrix:
         - xcodebuild build-for-testing test-without-building -scheme DifferenceKit -configuration Release -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 8' ENABLE_TESTABILITY=YES | xcpretty - c
         - xcodebuild build-for-testing test-without-building -scheme DifferenceKit -configuration Release -sdk appletvsimulator -destination 'platform=tvOS Simulator,name=Apple TV' ENABLE_TESTABILITY=YES | xcpretty -c
         - xcodebuild build -scheme DifferenceKit -configuration Release -sdk watchsimulator -destination 'platform=watchOS Simulator,name=Apple Watch - 38mm' ENABLE_TESTABILITY=YES | xcpretty -c
+    - os: osx
+      language: objective-c
+      osx_image: xcode9.4
+      script:
+        - xcodebuild build -scheme DifferenceKit -configuration Release ENABLE_TESTABILITY=YES | xcpretty -c
+        - xcodebuild build -scheme DifferenceKit -configuration Release -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 8' | xcpretty -c
 notifications:
-  email: false
+email: false
\ No newline at end of file

From 7d5a9cf85b1da6c566d177125cd605ba465d2e65 Mon Sep 17 00:00:00 2001
From: Ryo Aoyama <r.fe51028.r@gmail.com>
Date: Tue, 2 Oct 2018 17:54:27 +0900
Subject: [PATCH 08/11] End support for Swift 4.1 or lower

---
 .travis.yml                             | 6 ------
 Sources/Extensions/UIKitExtension.swift | 5 -----
 2 files changed, 11 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index a6c46ec..30d0800 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,11 +12,5 @@ matrix:
         - xcodebuild build-for-testing test-without-building -scheme DifferenceKit -configuration Release -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 8' ENABLE_TESTABILITY=YES | xcpretty - c
         - xcodebuild build-for-testing test-without-building -scheme DifferenceKit -configuration Release -sdk appletvsimulator -destination 'platform=tvOS Simulator,name=Apple TV' ENABLE_TESTABILITY=YES | xcpretty -c
         - xcodebuild build -scheme DifferenceKit -configuration Release -sdk watchsimulator -destination 'platform=watchOS Simulator,name=Apple Watch - 38mm' ENABLE_TESTABILITY=YES | xcpretty -c
-    - os: osx
-      language: objective-c
-      osx_image: xcode9.4
-      script:
-        - xcodebuild build -scheme DifferenceKit -configuration Release ENABLE_TESTABILITY=YES | xcpretty -c
-        - xcodebuild build -scheme DifferenceKit -configuration Release -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 8' | xcpretty -c
 notifications:
 email: false
\ No newline at end of file
diff --git a/Sources/Extensions/UIKitExtension.swift b/Sources/Extensions/UIKitExtension.swift
index f9bc60f..e40f75d 100644
--- a/Sources/Extensions/UIKitExtension.swift
+++ b/Sources/Extensions/UIKitExtension.swift
@@ -2,11 +2,6 @@
 import UIKit
 
 public extension UITableView {
-    #if swift(>=4.2)
-    #else
-    typealias RowAnimation = UITableViewRowAnimation
-    #endif
-
     /// Applies multiple animated updates in stages using `StagedChangeset`.
     ///
     /// - Note: There are combination of changes that crash when applied simultaneously in `performBatchUpdates`.

From 7886f39b4f790990207f97ecd44bd66fc1ab7a90 Mon Sep 17 00:00:00 2001
From: Ryo Aoyama <r.fe51028.r@gmail.com>
Date: Tue, 2 Oct 2018 17:56:35 +0900
Subject: [PATCH 09/11] Update docs

---
 docs/Extensions.html                      |   5 +-
 docs/Extensions/UICollectionView.html     |   5 +-
 docs/Extensions/UITableView.html          |   5 +-
 docs/Protocols.html                       |  41 +++-
 docs/Protocols/ContentEquatable.html      | 167 +++++++++++++++
 docs/Protocols/Differentiable.html        |  72 +------
 docs/Protocols/DifferentiableSection.html |   7 +-
 docs/Structs.html                         |  33 +--
 docs/Structs/AnyDifferentiable.html       |  35 ++--
 docs/Structs/ArraySection.html            |  16 +-
 docs/Structs/Changeset.html               | 236 ++++++++++++++++------
 docs/Structs/ElementPath.html             |   9 +-
 docs/Structs/StagedChangeset.html         |  55 +++--
 docs/index.html                           |  67 +++---
 docs/search.json                          |   2 +-
 15 files changed, 533 insertions(+), 222 deletions(-)
 create mode 100644 docs/Protocols/ContentEquatable.html

diff --git a/docs/Extensions.html b/docs/Extensions.html
index c92e607..5299973 100644
--- a/docs/Extensions.html
+++ b/docs/Extensions.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -141,7 +144,7 @@ <h4>Declaration</h4>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/Extensions/UICollectionView.html b/docs/Extensions/UICollectionView.html
index 9fc44da..96dac2e 100644
--- a/docs/Extensions/UICollectionView.html
+++ b/docs/Extensions/UICollectionView.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="../Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="../Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -175,7 +178,7 @@ <h4>Parameters</h4>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/Extensions/UITableView.html b/docs/Extensions/UITableView.html
index c25fbc1..d9e60a9 100644
--- a/docs/Extensions/UITableView.html
+++ b/docs/Extensions/UITableView.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="../Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="../Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -349,7 +352,7 @@ <h4>Parameters</h4>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/Protocols.html b/docs/Protocols.html
index 03403d8..d899c63 100644
--- a/docs/Protocols.html
+++ b/docs/Protocols.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -80,6 +83,38 @@ <h1>Protocols</h1>
 
           </section>
           <section class="section task-group-section">
+            <div class="task-group">
+              <ul>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:13DifferenceKit16ContentEquatableP"></a>
+                    <a name="//apple_ref/swift/Protocol/ContentEquatable" class="dashAnchor"></a>
+                    <a class="token" href="#/s:13DifferenceKit16ContentEquatableP">ContentEquatable</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Represents a value that can compare whether the content are equal.</p>
+
+                        <a href="Protocols/ContentEquatable.html" class="slightly-smaller">See more</a>
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">ContentEquatable</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+              </ul>
+            </div>
             <div class="task-group">
               <ul>
                 <li class="item">
@@ -95,7 +130,7 @@ <h1>Protocols</h1>
                     <section class="section">
                       <div class="pointer"></div>
                       <div class="abstract">
-                        <p>Represents the value that identified and can be compared to whether has updated.</p>
+                        <p>Represents the value that identified for differentiate.</p>
 
                         <a href="Protocols/Differentiable.html" class="slightly-smaller">See more</a>
                       </div>
@@ -103,7 +138,7 @@ <h1>Protocols</h1>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">Differentiable</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">Differentiable</span> <span class="p">:</span> <span class="kt"><a href="Protocols/ContentEquatable.html">ContentEquatable</a></span></code></pre>
 
                         </div>
                       </div>
@@ -147,7 +182,7 @@ <h4>Declaration</h4>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/Protocols/ContentEquatable.html b/docs/Protocols/ContentEquatable.html
new file mode 100644
index 0000000..7765bea
--- /dev/null
+++ b/docs/Protocols/ContentEquatable.html
@@ -0,0 +1,167 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <title>ContentEquatable Protocol Reference</title>
+    <link rel="stylesheet" type="text/css" href="../css/jazzy.css" />
+    <link rel="stylesheet" type="text/css" href="../css/highlight.css" />
+    <meta charset='utf-8'>
+    <script src="../js/jquery.min.js" defer></script>
+    <script src="../js/jazzy.js" defer></script>
+    
+  </head>
+  <body>
+    <a name="//apple_ref/swift/Protocol/ContentEquatable" class="dashAnchor"></a>
+    <a title="ContentEquatable Protocol Reference"></a>
+    <header>
+      <div class="content-wrapper">
+        <p><a href="../index.html">DifferenceKit Docs</a> (100% documented)</p>
+        <p class="header-right"><a href="https://github.com/ra1028/DifferenceKit"><img src="../img/gh.png"/>View on GitHub</a></p>
+      </div>
+    </header>
+    <div class="content-wrapper">
+      <p id="breadcrumbs">
+        <a href="../index.html">DifferenceKit Reference</a>
+        <img id="carat" src="../img/carat.png" />
+        ContentEquatable Protocol Reference
+      </p>
+    </div>
+    <div class="content-wrapper">
+      <nav class="sidebar">
+        <ul class="nav-groups">
+          <li class="nav-group-name">
+            <a href="../Extensions.html">Extensions</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Extensions/UICollectionView.html">UICollectionView</a>
+              </li>
+              <li class="nav-group-task">
+                <a href="../Extensions/UITableView.html">UITableView</a>
+              </li>
+            </ul>
+          </li>
+          <li class="nav-group-name">
+            <a href="../Protocols.html">Protocols</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
+              <li class="nav-group-task">
+                <a href="../Protocols/Differentiable.html">Differentiable</a>
+              </li>
+              <li class="nav-group-task">
+                <a href="../Protocols/DifferentiableSection.html">DifferentiableSection</a>
+              </li>
+            </ul>
+          </li>
+          <li class="nav-group-name">
+            <a href="../Structs.html">Structures</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Structs/AnyDifferentiable.html">AnyDifferentiable</a>
+              </li>
+              <li class="nav-group-task">
+                <a href="../Structs/ArraySection.html">ArraySection</a>
+              </li>
+              <li class="nav-group-task">
+                <a href="../Structs/Changeset.html">Changeset</a>
+              </li>
+              <li class="nav-group-task">
+                <a href="../Structs/ElementPath.html">ElementPath</a>
+              </li>
+              <li class="nav-group-task">
+                <a href="../Structs/StagedChangeset.html">StagedChangeset</a>
+              </li>
+            </ul>
+          </li>
+        </ul>
+      </nav>
+      <article class="main-content">
+        <section>
+          <section class="section">
+            <h1>ContentEquatable</h1>
+              <div class="declaration">
+                <div class="language">
+                  <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">ContentEquatable</span></code></pre>
+
+                </div>
+              </div>
+            <p>Represents a value that can compare whether the content are equal.</p>
+
+          </section>
+          <section class="section task-group-section">
+            <div class="task-group">
+              <ul>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:13DifferenceKit16ContentEquatableP02isC5Equal2toSbx_tF"></a>
+                    <a name="//apple_ref/swift/Method/isContentEqual(to:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:13DifferenceKit16ContentEquatableP02isC5Equal2toSbx_tF">isContentEqual(to:)</a>
+                    </code>
+                      <span class="declaration-note">
+                        Default implementation
+                      </span>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Indicate whether the content of <code>self</code> is equals to the content of
+the given source value.</p>
+
+                      </div>
+                      <h4>Default Implementation</h4>
+                      <div class="default_impl abstract">
+                        <p>Indicate whether the content of <code>self</code> is equals to the content of the given source value.
+Updates are compared using <code>==</code> operator of `Equatable&rsquo;.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">isContentEqual</span><span class="p">(</span><span class="n">to</span> <span class="nv">source</span><span class="p">:</span> <span class="k">Self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>source</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A source value to be compared.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>A Boolean value indicating whether the content of <code>self</code> is equals
+       to the content of the given source value.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+              </ul>
+            </div>
+          </section>
+        </section>
+        <section id="footer">
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
+          <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
+        </section>
+      </article>
+    </div>
+  </body>
+</div>
+</html>
diff --git a/docs/Protocols/Differentiable.html b/docs/Protocols/Differentiable.html
index f19d6e8..ce06335 100644
--- a/docs/Protocols/Differentiable.html
+++ b/docs/Protocols/Differentiable.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="../Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="../Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -78,11 +81,11 @@
             <h1>Differentiable</h1>
               <div class="declaration">
                 <div class="language">
-                  <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">Differentiable</span></code></pre>
+                  <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">Differentiable</span> <span class="p">:</span> <span class="kt"><a href="../Protocols/ContentEquatable.html">ContentEquatable</a></span></code></pre>
 
                 </div>
               </div>
-            <p>Represents the value that identified and can be compared to whether has updated.</p>
+            <p>Represents the value that identified for differentiate.</p>
 
           </section>
           <section class="section task-group-section">
@@ -143,80 +146,19 @@ <h4>Default Implementation</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="k">var</span> <span class="nv">differenceIdentifier</span><span class="p">:</span> <span class="nf">DifferenceIdentifier</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+                          <pre class="highlight swift"><code><span class="k">var</span> <span class="nv">differenceIdentifier</span><span class="p">:</span> <span class="kt"><a href="../Protocols/Differentiable.html#/s:13DifferenceKit14DifferentiableP0A10IdentifierQa">DifferenceIdentifier</a></span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
                     </section>
                   </div>
                 </li>
-                <li class="item">
-                  <div>
-                    <code>
-                    <a name="/s:13DifferenceKit14DifferentiableP14isContentEqual2toSbx_tF"></a>
-                    <a name="//apple_ref/swift/Method/isContentEqual(to:)" class="dashAnchor"></a>
-                    <a class="token" href="#/s:13DifferenceKit14DifferentiableP14isContentEqual2toSbx_tF">isContentEqual(to:)</a>
-                    </code>
-                      <span class="declaration-note">
-                        Default implementation
-                      </span>
-                  </div>
-                  <div class="height-container">
-                    <div class="pointer-container"></div>
-                    <section class="section">
-                      <div class="pointer"></div>
-                      <div class="abstract">
-                        <p>Indicate whether the content of <code>self</code> is equals to the content of
-the given source value.</p>
-
-                      </div>
-                      <h4>Default Implementation</h4>
-                      <div class="default_impl abstract">
-                        <p>Indicate whether the content of <code>self</code> is equals to the content of the given source value.
-Updates are compared using <code>==</code> operator of `Equatable&rsquo;.</p>
-
-                      </div>
-                      <div class="declaration">
-                        <h4>Declaration</h4>
-                        <div class="language">
-                          <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">isContentEqual</span><span class="p">(</span><span class="n">to</span> <span class="nv">source</span><span class="p">:</span> <span class="k">Self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span></code></pre>
-
-                        </div>
-                      </div>
-                      <div>
-                        <h4>Parameters</h4>
-                        <table class="graybox">
-                          <tbody>
-                            <tr>
-                              <td>
-                                <code>
-                                <em>source</em>
-                                </code>
-                              </td>
-                              <td>
-                                <div>
-                                  <p>A source value to be compared.</p>
-                                </div>
-                              </td>
-                            </tr>
-                          </tbody>
-                        </table>
-                      </div>
-                      <div>
-                        <h4>Return Value</h4>
-                        <p>A Boolean value indicating whether the content of <code>self</code> is equals
-       to the content of the given source value.</p>
-                      </div>
-                    </section>
-                  </div>
-                </li>
               </ul>
             </div>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/Protocols/DifferentiableSection.html b/docs/Protocols/DifferentiableSection.html
index 6a7c985..9efc09c 100644
--- a/docs/Protocols/DifferentiableSection.html
+++ b/docs/Protocols/DifferentiableSection.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="../Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="../Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -135,7 +138,7 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="k">var</span> <span class="nv">elements</span><span class="p">:</span> <span class="nf">Collection</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+                          <pre class="highlight swift"><code><span class="k">var</span> <span class="nv">elements</span><span class="p">:</span> <span class="kt"><a href="../Protocols/DifferentiableSection.html#/s:13DifferenceKit21DifferentiableSectionP10CollectionQa">Collection</a></span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -205,7 +208,7 @@ <h4>Parameters</h4>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/Structs.html b/docs/Structs.html
index 14a28f8..8c1b0cd 100644
--- a/docs/Structs.html
+++ b/docs/Structs.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -105,25 +108,25 @@ <h1>Structures</h1>
 that can be perform batch-updates with no crashes.</p>
 
 <p>Example for calculating differences between the two linear collections.</p>
-<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">String</span><span class="p">:</span> <span class="nf">Differentiable</span> <span class="p">{}</span>
+<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">String</span><span class="p">:</span> <span class="kt">Differentiable</span> <span class="p">{}</span>
 
 <span class="k">let</span> <span class="nv">source</span> <span class="o">=</span> <span class="p">[</span><span class="s">"A"</span><span class="p">,</span> <span class="s">"B"</span><span class="p">,</span> <span class="s">"C"</span><span class="p">]</span>
 <span class="k">let</span> <span class="nv">target</span> <span class="o">=</span> <span class="p">[</span><span class="s">"B"</span><span class="p">,</span> <span class="s">"C"</span><span class="p">,</span> <span class="s">"D"</span><span class="p">]</span>
 
-<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="nf">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
+<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="kt">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
 <span class="nf">print</span><span class="p">(</span><span class="n">changeset</span><span class="o">.</span><span class="n">isEmpty</span><span class="p">)</span>  <span class="c1">// prints "false"</span>
 </code></pre>
 
 <p>Example for calculating differences between the two sectioned collections.</p>
 <pre class="highlight swift"><code><span class="k">let</span> <span class="nv">source</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"A"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😉"</span><span class="p">]),</span>
+    <span class="kt">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"A"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😉"</span><span class="p">]),</span>
 <span class="p">]</span>
 <span class="k">let</span> <span class="nv">target</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"A"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😉, 😺"</span><span class="p">]),</span>
-    <span class="nf">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"B"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😪"</span><span class="p">])</span>
+    <span class="kt">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"A"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😉, 😺"</span><span class="p">]),</span>
+    <span class="kt">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"B"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😪"</span><span class="p">])</span>
 <span class="p">]</span>
 
-<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="nf">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">sectionedSource</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">sectionedTarget</span><span class="p">)</span>
+<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="kt">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">sectionedSource</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">sectionedTarget</span><span class="p">)</span>
 <span class="nf">print</span><span class="p">(</span><span class="n">changeset</span><span class="o">.</span><span class="n">isEmpty</span><span class="p">)</span>  <span class="c1">// prints "false"</span>
 </code></pre>
 
@@ -165,20 +168,20 @@ <h4>Declaration</h4>
 
 <p>You can store mixed-type elements in collection that require <code><a href="Protocols/Differentiable.html">Differentiable</a></code> conformance by
 wrapping mixed-type elements in <code>AnyDifferentiable</code>:</p>
-<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">String</span><span class="p">:</span> <span class="nf">Differentiable</span> <span class="p">{}</span>
-<span class="kd">extension</span> <span class="kt">Int</span><span class="p">:</span> <span class="nf">Differentiable</span> <span class="p">{}</span>
+<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">String</span><span class="p">:</span> <span class="kt">Differentiable</span> <span class="p">{}</span>
+<span class="kd">extension</span> <span class="kt">Int</span><span class="p">:</span> <span class="kt">Differentiable</span> <span class="p">{}</span>
 
 <span class="k">let</span> <span class="nv">source</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="s">"ABC"</span><span class="p">),</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="s">"ABC"</span><span class="p">),</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span>
 <span class="p">]</span>
 <span class="k">let</span> <span class="nv">target</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="s">"ABC"</span><span class="p">),</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="mi">100</span><span class="p">),</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="s">"ABC"</span><span class="p">),</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="mi">100</span><span class="p">),</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span>
 <span class="p">]</span>
 
-<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="nf">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
+<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="kt">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
 <span class="nf">print</span><span class="p">(</span><span class="n">changeset</span><span class="o">.</span><span class="n">isEmpty</span><span class="p">)</span>  <span class="c1">// prints "false"</span>
 </code></pre>
 
@@ -309,7 +312,7 @@ <h4>Declaration</h4>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/Structs/AnyDifferentiable.html b/docs/Structs/AnyDifferentiable.html
index 6d6f24d..d2ff66e 100644
--- a/docs/Structs/AnyDifferentiable.html
+++ b/docs/Structs/AnyDifferentiable.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="../Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="../Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -90,20 +93,20 @@ <h1>AnyDifferentiable</h1>
 
 <p>You can store mixed-type elements in collection that require <code><a href="../Protocols/Differentiable.html">Differentiable</a></code> conformance by
 wrapping mixed-type elements in <code>AnyDifferentiable</code>:</p>
-<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">String</span><span class="p">:</span> <span class="nf">Differentiable</span> <span class="p">{}</span>
-<span class="kd">extension</span> <span class="kt">Int</span><span class="p">:</span> <span class="nf">Differentiable</span> <span class="p">{}</span>
+<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">String</span><span class="p">:</span> <span class="kt">Differentiable</span> <span class="p">{}</span>
+<span class="kd">extension</span> <span class="kt">Int</span><span class="p">:</span> <span class="kt">Differentiable</span> <span class="p">{}</span>
 
 <span class="k">let</span> <span class="nv">source</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="s">"ABC"</span><span class="p">),</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="s">"ABC"</span><span class="p">),</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span>
 <span class="p">]</span>
 <span class="k">let</span> <span class="nv">target</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="s">"ABC"</span><span class="p">),</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="mi">100</span><span class="p">),</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="s">"ABC"</span><span class="p">),</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="mi">100</span><span class="p">),</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span>
 <span class="p">]</span>
 
-<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="nf">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
+<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="kt">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
 <span class="nf">print</span><span class="p">(</span><span class="n">changeset</span><span class="o">.</span><span class="n">isEmpty</span><span class="p">)</span>  <span class="c1">// prints "false"</span>
 </code></pre>
 
@@ -131,7 +134,8 @@ <h1>AnyDifferentiable</h1>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">base</span><span class="p">:</span> <span class="kt">Any</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">var</span> <span class="nv">base</span><span class="p">:</span> <span class="kt">Any</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -158,7 +162,8 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">differenceIdentifier</span><span class="p">:</span> <span class="kt">AnyHashable</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">var</span> <span class="nv">differenceIdentifier</span><span class="p">:</span> <span class="kt">AnyHashable</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -185,7 +190,8 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">init</span><span class="o">&lt;</span><span class="kt">D</span><span class="o">&gt;</span><span class="p">(</span><span class="n">_</span> <span class="nv">base</span><span class="p">:</span> <span class="kt">D</span><span class="p">)</span> <span class="k">where</span> <span class="kt">D</span> <span class="p">:</span> <span class="kt"><a href="../Protocols/Differentiable.html">Differentiable</a></span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="kd">init</span><span class="o">&lt;</span><span class="kt">D</span><span class="o">&gt;</span><span class="p">(</span><span class="n">_</span> <span class="nv">base</span><span class="p">:</span> <span class="kt">D</span><span class="p">)</span> <span class="k">where</span> <span class="kt">D</span> <span class="p">:</span> <span class="kt"><a href="../Protocols/Differentiable.html">Differentiable</a></span></code></pre>
 
                         </div>
                       </div>
@@ -231,7 +237,8 @@ <h4>Parameters</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">isContentEqual</span><span class="p">(</span><span class="n">to</span> <span class="nv">source</span><span class="p">:</span> <span class="kt">AnyDifferentiable</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="kd">func</span> <span class="nf">isContentEqual</span><span class="p">(</span><span class="n">to</span> <span class="nv">source</span><span class="p">:</span> <span class="kt">AnyDifferentiable</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span></code></pre>
 
                         </div>
                       </div>
@@ -285,7 +292,7 @@ <h4>Return Value</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="nf">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -297,7 +304,7 @@ <h4>Declaration</h4>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/Structs/ArraySection.html b/docs/Structs/ArraySection.html
index 4115b35..3db5bcb 100644
--- a/docs/Structs/ArraySection.html
+++ b/docs/Structs/ArraySection.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="../Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="../Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -165,7 +168,8 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">differenceIdentifier</span><span class="p">:</span> <span class="kt">Model</span><span class="o">.</span><span class="nf">DifferenceIdentifier</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">var</span> <span class="nv">differenceIdentifier</span><span class="p">:</span> <span class="kt">Model</span><span class="o">.</span><span class="kt">DifferenceIdentifier</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -192,7 +196,7 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">@inline(__always)</span>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
 <span class="kd">public</span> <span class="kd">init</span><span class="o">&lt;</span><span class="kt">C</span><span class="o">&gt;</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="kt">Model</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="kt">C</span><span class="p">)</span> <span class="k">where</span> <span class="kt">Element</span> <span class="o">==</span> <span class="kt">C</span><span class="o">.</span><span class="kt">Element</span><span class="p">,</span> <span class="kt">C</span> <span class="p">:</span> <span class="kt">Collection</span></code></pre>
 
                         </div>
@@ -251,7 +255,7 @@ <h4>Parameters</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">@inline(__always)</span>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
 <span class="kd">public</span> <span class="kd">init</span><span class="o">&lt;</span><span class="kt">C</span><span class="o">&gt;</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="kt">ArraySection</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="kt">C</span><span class="p">)</span> <span class="k">where</span> <span class="kt">Element</span> <span class="o">==</span> <span class="kt">C</span><span class="o">.</span><span class="kt">Element</span><span class="p">,</span> <span class="kt">C</span> <span class="p">:</span> <span class="kt">Collection</span></code></pre>
 
                         </div>
@@ -316,7 +320,7 @@ <h4>Parameters</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">@inline(__always)</span>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
 <span class="kd">public</span> <span class="kd">func</span> <span class="nf">isContentEqual</span><span class="p">(</span><span class="n">to</span> <span class="nv">source</span><span class="p">:</span> <span class="kt">ArraySection</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span></code></pre>
 
                         </div>
@@ -401,7 +405,7 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="nf">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -413,7 +417,7 @@ <h4>Declaration</h4>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/Structs/Changeset.html b/docs/Structs/Changeset.html
index fdd0909..c4957e2 100644
--- a/docs/Structs/Changeset.html
+++ b/docs/Structs/Changeset.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="../Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="../Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -336,60 +339,6 @@ <h4>Declaration</h4>
                     </section>
                   </div>
                 </li>
-                <li class="item">
-                  <div>
-                    <code>
-                    <a name="/s:13DifferenceKit9ChangesetV11changeCountSivp"></a>
-                    <a name="//apple_ref/swift/Property/changeCount" class="dashAnchor"></a>
-                    <a class="token" href="#/s:13DifferenceKit9ChangesetV11changeCountSivp">changeCount</a>
-                    </code>
-                  </div>
-                  <div class="height-container">
-                    <div class="pointer-container"></div>
-                    <section class="section">
-                      <div class="pointer"></div>
-                      <div class="abstract">
-                        <p>The number of all changes.</p>
-
-                      </div>
-                      <div class="declaration">
-                        <h4>Declaration</h4>
-                        <div class="language">
-                          <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">changeCount</span><span class="p">:</span> <span class="nf">Int</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
-
-                        </div>
-                      </div>
-                    </section>
-                  </div>
-                </li>
-                <li class="item">
-                  <div>
-                    <code>
-                    <a name="/s:13DifferenceKit9ChangesetV10hasChangesSbvp"></a>
-                    <a name="//apple_ref/swift/Property/hasChanges" class="dashAnchor"></a>
-                    <a class="token" href="#/s:13DifferenceKit9ChangesetV10hasChangesSbvp">hasChanges</a>
-                    </code>
-                  </div>
-                  <div class="height-container">
-                    <div class="pointer-container"></div>
-                    <section class="section">
-                      <div class="pointer"></div>
-                      <div class="abstract">
-                        <p>A Boolean value indicating whether has changes.</p>
-
-                      </div>
-                      <div class="declaration">
-                        <h4>Declaration</h4>
-                        <div class="language">
-                          <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">hasChanges</span><span class="p">:</span> <span class="nf">Bool</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
-
-                        </div>
-                      </div>
-                    </section>
-                  </div>
-                </li>
                 <li class="item">
                   <div>
                     <code>
@@ -410,7 +359,8 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="nf">init</span><span class="p">(</span>
     <span class="nv">data</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span>
     <span class="nv">sectionDeleted</span><span class="p">:</span> <span class="p">[</span><span class="kt">Int</span><span class="p">]</span> <span class="o">=</span> <span class="p">[],</span>
     <span class="nv">sectionInserted</span><span class="p">:</span> <span class="p">[</span><span class="kt">Int</span><span class="p">]</span> <span class="o">=</span> <span class="p">[],</span>
@@ -544,6 +494,178 @@ <h4>Parameters</h4>
                 </li>
               </ul>
             </div>
+            <div class="task-group">
+              <ul>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:13DifferenceKit9ChangesetV18sectionChangeCountSivp"></a>
+                    <a name="//apple_ref/swift/Property/sectionChangeCount" class="dashAnchor"></a>
+                    <a class="token" href="#/s:13DifferenceKit9ChangesetV18sectionChangeCountSivp">sectionChangeCount</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>The number of section changes.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">var</span> <span class="nv">sectionChangeCount</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:13DifferenceKit9ChangesetV18elementChangeCountSivp"></a>
+                    <a name="//apple_ref/swift/Property/elementChangeCount" class="dashAnchor"></a>
+                    <a class="token" href="#/s:13DifferenceKit9ChangesetV18elementChangeCountSivp">elementChangeCount</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>The number of element changes.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">var</span> <span class="nv">elementChangeCount</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:13DifferenceKit9ChangesetV11changeCountSivp"></a>
+                    <a name="//apple_ref/swift/Property/changeCount" class="dashAnchor"></a>
+                    <a class="token" href="#/s:13DifferenceKit9ChangesetV11changeCountSivp">changeCount</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>The number of all changes.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">var</span> <span class="nv">changeCount</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:13DifferenceKit9ChangesetV17hasSectionChangesSbvp"></a>
+                    <a name="//apple_ref/swift/Property/hasSectionChanges" class="dashAnchor"></a>
+                    <a class="token" href="#/s:13DifferenceKit9ChangesetV17hasSectionChangesSbvp">hasSectionChanges</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>A Boolean value indicating whether has section changes.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">var</span> <span class="nv">hasSectionChanges</span><span class="p">:</span> <span class="kt">Bool</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:13DifferenceKit9ChangesetV17hasElementChangesSbvp"></a>
+                    <a name="//apple_ref/swift/Property/hasElementChanges" class="dashAnchor"></a>
+                    <a class="token" href="#/s:13DifferenceKit9ChangesetV17hasElementChangesSbvp">hasElementChanges</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>A Boolean value indicating whether has element changes.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">var</span> <span class="nv">hasElementChanges</span><span class="p">:</span> <span class="kt">Bool</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:13DifferenceKit9ChangesetV10hasChangesSbvp"></a>
+                    <a name="//apple_ref/swift/Property/hasChanges" class="dashAnchor"></a>
+                    <a class="token" href="#/s:13DifferenceKit9ChangesetV10hasChangesSbvp">hasChanges</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>A Boolean value indicating whether has changes.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">var</span> <span class="nv">hasChanges</span><span class="p">:</span> <span class="kt">Bool</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+              </ul>
+            </div>
             <div class="task-group">
               <ul>
                 <li class="item">
@@ -595,7 +717,7 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="nf">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -607,7 +729,7 @@ <h4>Declaration</h4>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/Structs/ElementPath.html b/docs/Structs/ElementPath.html
index 8dc6287..17b744f 100644
--- a/docs/Structs/ElementPath.html
+++ b/docs/Structs/ElementPath.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="../Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="../Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -167,7 +170,7 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">@inline(__always)</span>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
 <span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">element</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="nv">section</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span></code></pre>
 
                         </div>
@@ -229,7 +232,7 @@ <h4>Parameters</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="nf">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -241,7 +244,7 @@ <h4>Declaration</h4>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/Structs/StagedChangeset.html b/docs/Structs/StagedChangeset.html
index a485b12..87e328e 100644
--- a/docs/Structs/StagedChangeset.html
+++ b/docs/Structs/StagedChangeset.html
@@ -42,6 +42,9 @@
           <li class="nav-group-name">
             <a href="../Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="../Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="../Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -92,25 +95,25 @@ <h1>StagedChangeset</h1>
 that can be perform batch-updates with no crashes.</p>
 
 <p>Example for calculating differences between the two linear collections.</p>
-<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">String</span><span class="p">:</span> <span class="nf">Differentiable</span> <span class="p">{}</span>
+<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">String</span><span class="p">:</span> <span class="kt">Differentiable</span> <span class="p">{}</span>
 
 <span class="k">let</span> <span class="nv">source</span> <span class="o">=</span> <span class="p">[</span><span class="s">"A"</span><span class="p">,</span> <span class="s">"B"</span><span class="p">,</span> <span class="s">"C"</span><span class="p">]</span>
 <span class="k">let</span> <span class="nv">target</span> <span class="o">=</span> <span class="p">[</span><span class="s">"B"</span><span class="p">,</span> <span class="s">"C"</span><span class="p">,</span> <span class="s">"D"</span><span class="p">]</span>
 
-<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="nf">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
+<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="kt">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
 <span class="nf">print</span><span class="p">(</span><span class="n">changeset</span><span class="o">.</span><span class="n">isEmpty</span><span class="p">)</span>  <span class="c1">// prints "false"</span>
 </code></pre>
 
 <p>Example for calculating differences between the two sectioned collections.</p>
 <pre class="highlight swift"><code><span class="k">let</span> <span class="nv">source</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"A"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😉"</span><span class="p">]),</span>
+    <span class="kt">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"A"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😉"</span><span class="p">]),</span>
 <span class="p">]</span>
 <span class="k">let</span> <span class="nv">target</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"A"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😉, 😺"</span><span class="p">]),</span>
-    <span class="nf">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"B"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😪"</span><span class="p">])</span>
+    <span class="kt">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"A"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😉, 😺"</span><span class="p">]),</span>
+    <span class="kt">Section</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="s">"B"</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"😪"</span><span class="p">])</span>
 <span class="p">]</span>
 
-<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="nf">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">sectionedSource</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">sectionedTarget</span><span class="p">)</span>
+<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="kt">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">sectionedSource</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">sectionedTarget</span><span class="p">)</span>
 <span class="nf">print</span><span class="p">(</span><span class="n">changeset</span><span class="o">.</span><span class="n">isEmpty</span><span class="p">)</span>  <span class="c1">// prints "false"</span>
 </code></pre>
 
@@ -138,7 +141,8 @@ <h1>StagedChangeset</h1>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">init</span><span class="o">&lt;</span><span class="kt">C</span><span class="o">&gt;</span><span class="p">(</span><span class="n">_</span> <span class="nv">changesets</span><span class="p">:</span> <span class="kt">C</span><span class="p">)</span> <span class="k">where</span> <span class="kt">C</span> <span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="kt">C</span><span class="o">.</span><span class="kt">Element</span> <span class="o">==</span> <span class="kt"><a href="../Structs/Changeset.html">Changeset</a></span><span class="o">&lt;</span><span class="kt">Collection</span><span class="o">&gt;</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="kd">init</span><span class="o">&lt;</span><span class="kt">C</span><span class="o">&gt;</span><span class="p">(</span><span class="n">_</span> <span class="nv">changesets</span><span class="p">:</span> <span class="kt">C</span><span class="p">)</span> <span class="k">where</span> <span class="kt">C</span> <span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="kt">C</span><span class="o">.</span><span class="kt">Element</span> <span class="o">==</span> <span class="kt"><a href="../Structs/Changeset.html">Changeset</a></span><span class="o">&lt;</span><span class="kt">Collection</span><span class="o">&gt;</span></code></pre>
 
                         </div>
                       </div>
@@ -214,7 +218,8 @@ <h4>Parameters</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">)</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">)</span></code></pre>
 
                         </div>
                       </div>
@@ -298,7 +303,8 @@ <h4>Parameters</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="nv">section</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="nv">section</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span></code></pre>
 
                         </div>
                       </div>
@@ -398,7 +404,8 @@ <h4>Parameters</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">)</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="kt">Collection</span><span class="p">)</span></code></pre>
 
                         </div>
                       </div>
@@ -459,7 +466,8 @@ <h4>Parameters</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">()</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="nf">init</span><span class="p">()</span></code></pre>
 
                         </div>
                       </div>
@@ -485,7 +493,8 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">startIndex</span><span class="p">:</span> <span class="nf">Int</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">var</span> <span class="nv">startIndex</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -511,7 +520,8 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">endIndex</span><span class="p">:</span> <span class="nf">Int</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">var</span> <span class="nv">endIndex</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -537,7 +547,8 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">index</span><span class="p">(</span><span class="n">after</span> <span class="nv">i</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Int</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="kd">func</span> <span class="nf">index</span><span class="p">(</span><span class="n">after</span> <span class="nv">i</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Int</span></code></pre>
 
                         </div>
                       </div>
@@ -563,7 +574,8 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">subscript</span><span class="p">(</span><span class="nv">position</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt"><a href="../Structs/Changeset.html">Changeset</a></span><span class="o">&lt;</span><span class="kt">Collection</span><span class="o">&gt;</span> <span class="p">{</span> <span class="k">get</span> <span class="k">set</span> <span class="p">}</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="nf">subscript</span><span class="p">(</span><span class="nv">position</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt"><a href="../Structs/Changeset.html">Changeset</a></span><span class="o">&lt;</span><span class="kt">Collection</span><span class="o">&gt;</span> <span class="p">{</span> <span class="k">get</span> <span class="k">set</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -589,7 +601,8 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">mutating</span> <span class="kd">func</span> <span class="n">replaceSubrange</span><span class="o">&lt;</span><span class="kt">C</span><span class="p">,</span> <span class="kt">R</span><span class="o">&gt;</span><span class="p">(</span><span class="n">_</span> <span class="nv">subrange</span><span class="p">:</span> <span class="kt">R</span><span class="p">,</span> <span class="n">with</span> <span class="nv">newElements</span><span class="p">:</span> <span class="kt">C</span><span class="p">)</span> <span class="k">where</span> <span class="kt">C</span> <span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="kt">R</span> <span class="p">:</span> <span class="kt">RangeExpression</span><span class="p">,</span> <span class="kt">C</span><span class="o">.</span><span class="kt">Element</span> <span class="o">==</span> <span class="kt"><a href="../Structs/Changeset.html">Changeset</a></span><span class="o">&lt;</span><span class="kt">Collection</span><span class="o">&gt;</span><span class="p">,</span> <span class="kt">R</span><span class="o">.</span><span class="kt">Bound</span> <span class="o">==</span> <span class="kt">Int</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="k">mutating</span> <span class="kd">func</span> <span class="n">replaceSubrange</span><span class="o">&lt;</span><span class="kt">C</span><span class="p">,</span> <span class="kt">R</span><span class="o">&gt;</span><span class="p">(</span><span class="n">_</span> <span class="nv">subrange</span><span class="p">:</span> <span class="kt">R</span><span class="p">,</span> <span class="n">with</span> <span class="nv">newElements</span><span class="p">:</span> <span class="kt">C</span><span class="p">)</span> <span class="k">where</span> <span class="kt">C</span> <span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="kt">R</span> <span class="p">:</span> <span class="kt">RangeExpression</span><span class="p">,</span> <span class="kt">C</span><span class="o">.</span><span class="kt">Element</span> <span class="o">==</span> <span class="kt"><a href="../Structs/Changeset.html">Changeset</a></span><span class="o">&lt;</span><span class="kt">Collection</span><span class="o">&gt;</span><span class="p">,</span> <span class="kt">R</span><span class="o">.</span><span class="kt">Bound</span> <span class="o">==</span> <span class="kt">Int</span></code></pre>
 
                         </div>
                       </div>
@@ -619,7 +632,8 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">static</span> <span class="kd">func</span> <span class="o">==</span> <span class="p">(</span><span class="nv">lhs</span><span class="p">:</span> <span class="kt">StagedChangeset</span><span class="p">,</span> <span class="nv">rhs</span><span class="p">:</span> <span class="kt">StagedChangeset</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="kd">static</span> <span class="kd">func</span> <span class="o">==</span> <span class="p">(</span><span class="nv">lhs</span><span class="p">:</span> <span class="kt">StagedChangeset</span><span class="p">,</span> <span class="nv">rhs</span><span class="p">:</span> <span class="kt">StagedChangeset</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span></code></pre>
 
                         </div>
                       </div>
@@ -649,7 +663,8 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="n">arrayLiteral</span> <span class="nv">elements</span><span class="p">:</span> <span class="kt"><a href="../Structs/Changeset.html">Changeset</a></span><span class="o">&lt;</span><span class="kt">Collection</span><span class="o">&gt;...</span><span class="p">)</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">@inlinable</span>
+<span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="n">arrayLiteral</span> <span class="nv">elements</span><span class="p">:</span> <span class="kt"><a href="../Structs/Changeset.html">Changeset</a></span><span class="o">&lt;</span><span class="kt">Collection</span><span class="o">&gt;...</span><span class="p">)</span></code></pre>
 
                         </div>
                       </div>
@@ -679,7 +694,7 @@ <h4>Declaration</h4>
                         <h4>Declaration</h4>
                         <div class="language">
                           <p class="aside-title">Swift</p>
-                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="nf">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
 
                         </div>
                       </div>
@@ -691,7 +706,7 @@ <h4>Declaration</h4>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/index.html b/docs/index.html
index 88f3433..85b5185 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -41,6 +41,9 @@
           <li class="nav-group-name">
             <a href="Protocols.html">Protocols</a>
             <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a href="Protocols/ContentEquatable.html">ContentEquatable</a>
+              </li>
               <li class="nav-group-task">
                 <a href="Protocols/Differentiable.html">Differentiable</a>
               </li>
@@ -149,15 +152,15 @@ <h3 id='example-codes' class='heading'>Example codes</h3>
 
 <p>The type of the element that to take the differences must be conform to the <code><a href="Protocols/Differentiable.html">Differentiable</a></code> protocol.<br>
 The <code>differenceIdentifier</code>&lsquo;s type is determined generic by the associated type:</p>
-<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">User</span><span class="p">:</span> <span class="nf">Differentiable</span> <span class="p">{</span>
+<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">User</span><span class="p">:</span> <span class="kt">Differentiable</span> <span class="p">{</span>
     <span class="k">let</span> <span class="nv">id</span><span class="p">:</span> <span class="kt">Int</span>
     <span class="k">let</span> <span class="nv">name</span><span class="p">:</span> <span class="kt">String</span>
 
-    <span class="k">var</span> <span class="nv">differenceIdentifier</span><span class="p">:</span> <span class="nf">Int</span> <span class="p">{</span>
+    <span class="k">var</span> <span class="nv">differenceIdentifier</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span>
         <span class="k">return</span> <span class="n">id</span>
     <span class="p">}</span>
 
-    <span class="kd">func</span> <span class="nf">isContentEqual</span><span class="p">(</span><span class="n">to</span> <span class="nv">source</span><span class="p">:</span> <span class="kt">User</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nf">Bool</span> <span class="p">{</span>
+    <span class="kd">func</span> <span class="nf">isContentEqual</span><span class="p">(</span><span class="n">to</span> <span class="nv">source</span><span class="p">:</span> <span class="kt">User</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span> <span class="p">{</span>
         <span class="k">return</span> <span class="n">name</span> <span class="o">==</span> <span class="n">source</span><span class="o">.</span><span class="n">name</span>
     <span class="p">}</span>
 <span class="p">}</span>
@@ -166,62 +169,60 @@ <h3 id='example-codes' class='heading'>Example codes</h3>
 <p>In the case of definition above, <code>id</code> uniquely identifies the element and get to know the user updated by comparing equality of <code>name</code> of the elements in source and target.</p>
 
 <p>There are default implementations of <code><a href="Protocols/Differentiable.html">Differentiable</a></code> for the types that conformed to <code>Equatable</code> or <code>Hashable</code>：</p>
-<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">extension</span> <span class="kt">Differentiable</span> <span class="k">where</span> <span class="k">Self</span><span class="p">:</span> <span class="nf">Equatable</span> <span class="p">{</span>
-    <span class="kd">func</span> <span class="nf">isContentEqual</span><span class="p">(</span><span class="n">to</span> <span class="nv">source</span><span class="p">:</span> <span class="k">Self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nf">Bool</span> <span class="p">{</span>
-        <span class="k">return</span> <span class="k">self</span> <span class="o">==</span> <span class="n">source</span>
-    <span class="p">}</span>
+<pre class="highlight swift"><code><span class="c1">// If `Self` conform to `Hashable`.</span>
+<span class="k">var</span> <span class="nv">differenceIdentifier</span><span class="p">:</span> <span class="k">Self</span> <span class="p">{</span>
+    <span class="k">return</span> <span class="k">self</span>
 <span class="p">}</span>
 
-<span class="kd">public</span> <span class="kd">extension</span> <span class="kt">Differentiable</span> <span class="k">where</span> <span class="k">Self</span><span class="p">:</span> <span class="nf">Hashable</span> <span class="p">{</span>
-    <span class="k">var</span> <span class="nv">differenceIdentifier</span><span class="p">:</span> <span class="nf">Self</span> <span class="p">{</span>
-        <span class="k">return</span> <span class="k">self</span>
-    <span class="p">}</span>
+<span class="c1">// If `Self` conform to `Equatable`.</span>
+<span class="kd">func</span> <span class="nf">isContentEqual</span><span class="p">(</span><span class="n">to</span> <span class="nv">source</span><span class="p">:</span> <span class="k">Self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span> <span class="p">{</span>
+    <span class="k">return</span> <span class="k">self</span> <span class="o">==</span> <span class="n">source</span>
 <span class="p">}</span>
 </code></pre>
 
 <p>So, you can simply:</p>
-<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">String</span><span class="p">:</span> <span class="nf">Differentiable</span> <span class="p">{}</span>
+<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">String</span><span class="p">:</span> <span class="kt">Differentiable</span> <span class="p">{}</span>
 </code></pre>
 
 <p>Calculates the differences by creating <code><a href="Structs/StagedChangeset.html">StagedChangeset</a></code> from two collections of elements conforming to <code><a href="Protocols/Differentiable.html">Differentiable</a></code>:</p>
 <pre class="highlight swift"><code><span class="k">let</span> <span class="nv">source</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Vincent"</span><span class="p">),</span>
-    <span class="nf">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Jules"</span><span class="p">)</span>
+    <span class="kt">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Vincent"</span><span class="p">),</span>
+    <span class="kt">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Jules"</span><span class="p">)</span>
 <span class="p">]</span>
 <span class="k">let</span> <span class="nv">target</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Jules"</span><span class="p">),</span>
-    <span class="nf">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Vincent"</span><span class="p">),</span>
-    <span class="nf">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Butch"</span><span class="p">)</span>
+    <span class="kt">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Jules"</span><span class="p">),</span>
+    <span class="kt">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Vincent"</span><span class="p">),</span>
+    <span class="kt">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Butch"</span><span class="p">)</span>
 <span class="p">]</span>
 
-<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="nf">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
+<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="kt">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
 </code></pre>
 
 <p>If you want to include multiple types conformed to <code><a href="Protocols/Differentiable.html">Differentiable</a></code> in the collection, use <code><a href="Structs/AnyDifferentiable.html">AnyDifferentiable</a></code>:</p>
 <pre class="highlight swift"><code><span class="k">let</span> <span class="nv">source</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="s">"A"</span><span class="p">),</span>
-    <span class="nf">AnyDifferentiable</span><span class="p">(</span><span class="nf">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Vincent"</span><span class="p">))</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="s">"A"</span><span class="p">),</span>
+    <span class="kt">AnyDifferentiable</span><span class="p">(</span><span class="kt">User</span><span class="p">(</span><span class="nv">id</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="nv">name</span><span class="p">:</span> <span class="s">"Vincent"</span><span class="p">))</span>
 <span class="p">]</span>
 </code></pre>
 
 <p>In the case of sectioned collection, the section itself must have a unique identifier and be able to compare whether there is an update.<br>
 So each section must conform to <code><a href="Protocols/DifferentiableSection.html">DifferentiableSection</a></code> protocol, but in most cases you can use <code><a href="Structs/ArraySection.html">ArraySection</a></code> that general type conformed to it.<br>
 <code><a href="Structs/ArraySection.html">ArraySection</a></code> requires a model conforming to <code><a href="Protocols/Differentiable.html">Differentiable</a></code> for differentiate from other sections:</p>
-<pre class="highlight swift"><code><span class="kd">enum</span> <span class="kt">Model</span><span class="p">:</span> <span class="nf">Differentiable</span> <span class="p">{</span>
+<pre class="highlight swift"><code><span class="kd">enum</span> <span class="kt">Model</span><span class="p">:</span> <span class="kt">Differentiable</span> <span class="p">{</span>
     <span class="k">case</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span>
 <span class="p">}</span>
 
 <span class="k">let</span> <span class="nv">source</span><span class="p">:</span> <span class="p">[</span><span class="kt">ArraySection</span><span class="o">&lt;</span><span class="kt">Model</span><span class="p">,</span> <span class="kt">String</span><span class="o">&gt;</span><span class="p">]</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">ArraySection</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="o">.</span><span class="n">a</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"A"</span><span class="p">,</span> <span class="s">"B"</span><span class="p">]),</span>
-    <span class="nf">ArraySection</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="o">.</span><span class="n">b</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"C"</span><span class="p">])</span>
+    <span class="kt">ArraySection</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="o">.</span><span class="n">a</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"A"</span><span class="p">,</span> <span class="s">"B"</span><span class="p">]),</span>
+    <span class="kt">ArraySection</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="o">.</span><span class="n">b</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"C"</span><span class="p">])</span>
 <span class="p">]</span>
 <span class="k">let</span> <span class="nv">target</span><span class="p">:</span> <span class="p">[</span><span class="kt">ArraySection</span><span class="o">&lt;</span><span class="kt">Model</span><span class="p">,</span> <span class="kt">String</span><span class="o">&gt;</span><span class="p">]</span> <span class="o">=</span> <span class="p">[</span>
-    <span class="nf">ArraySection</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="o">.</span><span class="n">c</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"D"</span><span class="p">,</span> <span class="s">"E"</span><span class="p">]),</span>
-    <span class="nf">ArraySection</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="o">.</span><span class="n">a</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"A"</span><span class="p">]),</span>
-    <span class="nf">ArraySection</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="o">.</span><span class="n">b</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"B"</span><span class="p">,</span> <span class="s">"C"</span><span class="p">])</span>
+    <span class="kt">ArraySection</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="o">.</span><span class="n">c</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"D"</span><span class="p">,</span> <span class="s">"E"</span><span class="p">]),</span>
+    <span class="kt">ArraySection</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="o">.</span><span class="n">a</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"A"</span><span class="p">]),</span>
+    <span class="kt">ArraySection</span><span class="p">(</span><span class="nv">model</span><span class="p">:</span> <span class="o">.</span><span class="n">b</span><span class="p">,</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[</span><span class="s">"B"</span><span class="p">,</span> <span class="s">"C"</span><span class="p">])</span>
 <span class="p">]</span>
 
-<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="nf">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
+<span class="k">let</span> <span class="nv">changeset</span> <span class="o">=</span> <span class="kt">StagedChangeset</span><span class="p">(</span><span class="nv">source</span><span class="p">:</span> <span class="n">source</span><span class="p">,</span> <span class="nv">target</span><span class="p">:</span> <span class="n">target</span><span class="p">)</span>
 </code></pre>
 
 <p>You can perform incremental updates on <code>UITableView</code> and <code>UICollectionView</code> using the created <code><a href="Structs/StagedChangeset.html">StagedChangeset</a></code>.  </p>
@@ -243,7 +244,7 @@ <h3 id='example-codes' class='heading'>Example codes</h3>
 <h2 id='comparison-with-other-frameworks' class='heading'>Comparison with Other Frameworks</h2>
 
 <p>Made a fair comparison as much as possible in features and performance with other <strong>popular</strong> and <strong>awesome</strong> frameworks.<br>
-⚠️ This does <code>NOT</code> determine superiority or inferiority of the frameworks. I know that each framework has different benefits.<br>
+This does <strong>NOT</strong> determine superiority or inferiority of the frameworks. I know that each framework has different benefits.<br>
 The frameworks and its version that compared is below.  </p>
 
 <ul>
@@ -481,7 +482,7 @@ <h4 id='from-5-000-elements-to-500-deleted-and-500-inserted' class='heading'>- F
 </thead><tbody>
 <tr>
 <td style="text-align: left">DifferenceKit</td>
-<td style="text-align: left">0.0032</td>
+<td style="text-align: left">0.0022</td>
 </tr>
 <tr>
 <td style="text-align: left">RxDataSources</td>
@@ -522,7 +523,7 @@ <h4 id='from-10-000-elements-to-1-000-deleted-and-1-000-inserted' class='heading
 </thead><tbody>
 <tr>
 <td style="text-align: left">DifferenceKit</td>
-<td style="text-align: left">0.0076</td>
+<td style="text-align: left">0.0049</td>
 </tr>
 <tr>
 <td style="text-align: left">RxDataSources</td>
@@ -563,7 +564,7 @@ <h4 id='from-100-000-elements-to-10-000-deleted-and-10-000-inserted' class='head
 </thead><tbody>
 <tr>
 <td style="text-align: left">DifferenceKit</td>
-<td style="text-align: left">0.087</td>
+<td style="text-align: left">0.057</td>
 </tr>
 <tr>
 <td style="text-align: left">RxDataSources</td>
@@ -599,7 +600,7 @@ <h4 id='from-100-000-elements-to-10-000-deleted-and-10-000-inserted' class='head
 <h2 id='requirements' class='heading'>Requirements</h2>
 
 <ul>
-<li>Swift4.1+</li>
+<li>Swift4.2+</li>
 <li>iOS 9.0+</li>
 <li>tvOS 9.0+</li>
 <li>OS X 10.9+</li>
@@ -666,7 +667,7 @@ <h2 id='license' class='heading'>License</h2>
           </section>
         </section>
         <section id="footer">
-          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-09-19)</p>
+          <p>&copy; 2018 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2018-10-02)</p>
           <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
         </section>
       </article>
diff --git a/docs/search.json b/docs/search.json
index e0365f9..2a0c3c7 100644
--- a/docs/search.json
+++ b/docs/search.json
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\ No newline at end of file
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\ No newline at end of file

From eea050c77c41a9ede6f71edaa2cf39c5711e023f Mon Sep 17 00:00:00 2001
From: Ryo Aoyama <r.fe51028.r@gmail.com>
Date: Tue, 2 Oct 2018 17:57:10 +0900
Subject: [PATCH 10/11] Update podspec

---
 DifferenceKit.podspec | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/DifferenceKit.podspec b/DifferenceKit.podspec
index 1a05f32..88a8334 100644
--- a/DifferenceKit.podspec
+++ b/DifferenceKit.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |spec|
   spec.name = 'DifferenceKit'
-  spec.version  = '0.6.0'
+  spec.version  = '0.7.0'
   spec.author = { 'ra1028' => 'r.fe51028.r@gmail.com' }
   spec.homepage = 'https://github.com/ra1028/DifferenceKit'
   spec.documentation_url = 'https://ra1028.github.io/DifferenceKit'

From ff1cd540acd8e39cb11ab753992554f7f5839074 Mon Sep 17 00:00:00 2001
From: Ryo Aoyama <r.fe51028.r@gmail.com>
Date: Tue, 2 Oct 2018 18:03:56 +0900
Subject: [PATCH 11/11] Refactor

---
 Sources/AnyDifferentiable.swift | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Sources/AnyDifferentiable.swift b/Sources/AnyDifferentiable.swift
index 75b4492..ed3032f 100644
--- a/Sources/AnyDifferentiable.swift
+++ b/Sources/AnyDifferentiable.swift
@@ -44,7 +44,7 @@ public struct AnyDifferentiable: Differentiable {
     ///   - base: A differentiable value to wrap.
     @inlinable
     public init<D: Differentiable>(_ base: D) {
-        box = ConcretDifferentiableBox(base)
+        box = DifferentiableBox(base)
     }
 
     /// Indicate whether the content of `base` is equals to the content of the given source value.
@@ -75,7 +75,7 @@ internal protocol AnyDifferentiableBox {
 }
 
 @usableFromInline
-internal struct ConcretDifferentiableBox<Base: Differentiable>: AnyDifferentiableBox {
+internal struct DifferentiableBox<Base: Differentiable>: AnyDifferentiableBox {
     @usableFromInline
     internal let baseComponent: Base