diff --git a/crates/musli-descriptive/src/lib.rs b/crates/musli-descriptive/src/lib.rs
index 83154e33b..24f6fcce1 100644
--- a/crates/musli-descriptive/src/lib.rs
+++ b/crates/musli-descriptive/src/lib.rs
@@ -137,6 +137,6 @@ pub use self::error::Error;
 #[cfg(feature = "test")]
 #[cfg_attr(doc_cfg, doc(cfg(feature = "test")))]
 #[doc(hidden)]
-pub use self::test::{transcode, Typed};
+pub use self::test::transcode;
 
 musli_utils::simdutf8!();
diff --git a/crates/musli-descriptive/src/test.rs b/crates/musli-descriptive/src/test.rs
index 3cd3ef820..ef424b8e4 100644
--- a/crates/musli-descriptive/src/test.rs
+++ b/crates/musli-descriptive/src/test.rs
@@ -2,44 +2,8 @@
 
 use core::fmt::Debug;
 
-use musli::de::PackDecoder;
 use musli::mode::DefaultMode;
-use musli::{Decode, Decoder, Encode};
-
-use crate::tag::Tag;
-
-/// A typed field, which is prefixed with a type tag.
-///
-/// This is used in combination with the storage deserializer to "inspect" type
-/// tags.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub struct Typed<T> {
-    tag: Tag,
-    value: T,
-}
-
-impl<T> Typed<T> {
-    /// Construct a new typed field.
-    pub const fn new(tag: Tag, value: T) -> Self {
-        Self { tag, value }
-    }
-}
-
-impl<'de, M, T> Decode<'de, M> for Typed<T>
-where
-    T: Decode<'de, M>,
-{
-    fn decode<D>(_: &D::Cx, decoder: D) -> Result<Self, D::Error>
-    where
-        D: Decoder<'de, Mode = M>,
-    {
-        decoder.decode_pack(|pack| {
-            let tag = pack.decode_next()?.decode()?;
-            let value = pack.decode_next()?.decode()?;
-            Ok(Self { tag, value })
-        })
-    }
-}
+use musli::{Decode, Encode};
 
 musli_utils::test_fns!("descriptive", #[musli_value]);
 
diff --git a/crates/musli-wire/src/tag.rs b/crates/musli-wire/src/tag.rs
index 7a5c6a7ef..78815a970 100644
--- a/crates/musli-wire/src/tag.rs
+++ b/crates/musli-wire/src/tag.rs
@@ -5,7 +5,8 @@
 use core::fmt;
 use core::mem;
 
-use musli::{Decode, Decoder};
+#[cfg(feature = "test")]
+use musli::{Decode, Encode};
 
 /// Data masked into the data type.
 pub(crate) const DATA_MASK: u8 = 0b00_111111;
@@ -40,7 +41,9 @@ pub enum Kind {
 /// question. It is primarily used to smuggle extra data for the kind in
 /// question.
 #[derive(Clone, Copy, PartialEq, Eq, Hash)]
+#[cfg_attr(feature = "test", derive(Encode, Decode))]
 #[repr(transparent)]
+#[cfg_attr(feature = "test", musli(transparent))]
 pub struct Tag {
     /// The internal representation of the tag.
     repr: u8,
@@ -141,13 +144,3 @@ impl fmt::Debug for Tag {
             .finish()
     }
 }
-
-impl<'de, M> Decode<'de, M> for Tag {
-    #[inline]
-    fn decode<D>(_: &D::Cx, decoder: D) -> Result<Self, D::Error>
-    where
-        D: Decoder<'de, Mode = M>,
-    {
-        Ok(Self::from_byte(decoder.decode()?))
-    }
-}
diff --git a/crates/musli-wire/src/test.rs b/crates/musli-wire/src/test.rs
index a10973efe..9851a62b2 100644
--- a/crates/musli-wire/src/test.rs
+++ b/crates/musli-wire/src/test.rs
@@ -2,9 +2,8 @@
 
 use core::fmt::Debug;
 
-use musli::de::PackDecoder;
 use musli::mode::DefaultMode;
-use musli::{Decode, Decoder, Encode};
+use musli::{Decode, Encode};
 
 use crate::tag::Tag;
 
@@ -12,35 +11,21 @@ use crate::tag::Tag;
 ///
 /// This is used in combination with the storage deserializer to "inspect" type
 /// tags.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub struct Typed<T> {
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Encode, Decode)]
+#[musli(packed)]
+pub struct Typed<const N: usize> {
     tag: Tag,
-    value: T,
+    #[musli(bytes)]
+    value: [u8; N],
 }
 
-impl<T> Typed<T> {
+impl<const N: usize> Typed<N> {
     /// Construct a new typed field.
-    pub const fn new(tag: Tag, value: T) -> Self {
+    pub const fn new(tag: Tag, value: [u8; N]) -> Self {
         Self { tag, value }
     }
 }
 
-impl<'de, M, T> Decode<'de, M> for Typed<T>
-where
-    T: Decode<'de, M>,
-{
-    fn decode<D>(_: &D::Cx, decoder: D) -> Result<Self, D::Error>
-    where
-        D: Decoder<'de, Mode = M>,
-    {
-        decoder.decode_pack(|pack| {
-            let tag = pack.decode_next()?.decode()?;
-            let value = pack.decode_next()?.decode()?;
-            Ok(Self { tag, value })
-        })
-    }
-}
-
 musli_utils::test_fns!("wire");
 
 /// Encode a type as one and decode as another.
diff --git a/tests/tests/numbers.rs b/tests/tests/numbers.rs
index 6b8a83d57..c44604d01 100644
--- a/tests/tests/numbers.rs
+++ b/tests/tests/numbers.rs
@@ -21,7 +21,7 @@ struct Unpacked {
     b: (Tag, Tag),
     c: (Tag, Tag),
     d: (Tag, Tag),
-    e: (Tag, Typed<[u8; 5]>),
+    e: (Tag, Typed<5>),
 }
 
 #[test]
diff --git a/tests/tests/struct_name.rs b/tests/tests/struct_name.rs
index 48643580b..601d6883e 100644
--- a/tests/tests/struct_name.rs
+++ b/tests/tests/struct_name.rs
@@ -52,9 +52,9 @@ fn named_struct_unpack() {
     #[musli(packed)]
     pub struct Unpacked {
         field_count: Tag,
-        field1_name: Typed<[u8; 6]>,
-        field1_value: Typed<[u8; 3]>,
-        field2_name: Typed<[u8; 6]>,
+        field1_name: Typed<6>,
+        field1_value: Typed<3>,
+        field2_name: Typed<6>,
         field2_value: Tag,
     }
 
@@ -122,7 +122,7 @@ fn indexed_struct_unpack() {
     pub struct Unpacked {
         field_count: Tag,
         field1_index: Tag,
-        field1_value: Typed<[u8; 3]>,
+        field1_value: Typed<3>,
         field2_index: Tag,
         field2_value: Tag,
     }