Don't consider kotlinx and javax types to be builtin (kotest#3899)

Fixes kotest#3855

---------

Co-authored-by: Sam <sam@sksamuel.com>

kotest-assertions/kotest-assertions-core/src/jvmMain/kotlin/io/kotest/matchers/equality/compare.kt

@@ -161,7 +161,7 @@ internal fun useEq(
    val typeIsJavaOrKotlinBuiltIn by lazy {
       val bestName = typeName.bestName()
       bestName.startsWith("kotlin") ||
-         bestName.startsWith("java") ||
+         (bestName.startsWith("java") && !bestName.startsWith("javax.xml.bind.JAXBElement")) ||
          builtins.contains(bestName)
    }
    val expectedOrActualIsEnum = actual is Enum<*>

kotest-assertions/kotest-assertions-core/src/jvmMain/kotlin/io/kotest/matchers/equality/primitives.kt

@@ -0,0 +1,31 @@
+package io.kotest.matchers.equality
+
+/**
+ * This is currently unused but will form the basis of reflection based checks in 6.0
+ */
+internal fun <T> T.isBuiltInType() =
+   this is Number
+   || this is UInt
+   || this is ULong
+   || this is UByte
+   || this is UShort
+   || this is String
+   || this is Boolean
+   || this is Char
+   || this is IntArray
+   || this is CharArray
+   || this is LongArray
+   || this is ShortArray
+   || this is ByteArray
+   || this is DoubleArray
+   || this is FloatArray
+   || this is BooleanArray
+   || this is UIntArray
+   || this is ULongArray
+   || this is UByteArray
+   || this is UShortArray
+   || this is Array<*>
+   || this is List<*>
+   || this is Set<*>
+   || this is Map<*, *>
+   || this is Sequence<*>

kotest-assertions/kotest-assertions-core/src/jvmMain/kotlin/io/kotest/matchers/equality/reflection.kt

@@ -620,7 +620,7 @@ private fun requiresUseOfDefaultEq(
    useDefaultEqualForFields: List<String>
 ): Boolean {
    val expectedOrActualIsNull = actual == null || expected == null
-   val typeIsJavaOrKotlinBuiltIn by lazy { typeName.startsWith("kotlin") || typeName.startsWith("java") }
+   val typeIsJavaOrKotlinBuiltIn by lazy { typeName.startsWith("kotlin.") || typeName.startsWith("java.") }
    val expectedOrActualIsEnum = actual is Enum<*>
       || expected is Enum<*>
       || (actual != null && actual::class.java.isEnum)

kotest-tests/kotest-tests-core/build.gradle.kts

@@ -11,6 +11,8 @@ kotlin {
             implementation(projects.kotestAssertions.kotestAssertionsCore)
             // this is here to test that the intellij marker 'dummy' test doesn't appear in intellij
             implementation(libs.junit.jupiter.engine)
+            // We want to test that JAXBElement is compared properly
+            implementation("javax.xml.bind:jaxb-api:2.3.1")
          }
       }
    }

kotest-tests/kotest-tests-core/src/jvmTest/kotlin/com/sksamuel/kotest/JaxbElementTest.kt

@@ -0,0 +1,29 @@
+package com.sksamuel.kotest
+
+import io.kotest.assertions.shouldFail
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.equality.shouldBeEqualToComparingFields
+import io.kotest.matchers.string.shouldContain
+import javax.xml.bind.JAXBElement
+import javax.xml.namespace.QName
+
+class JaxbElementTest : FunSpec({
+
+   context("Comparing JAXBElement reflectively works as expected") {
+
+      val jaxbElement = JAXBElement(QName.valueOf("name"), Int::class.java, 123)
+      val otherJaxbElement = JAXBElement(QName.valueOf("name"), Int::class.java, 124)
+
+      test("!should pass when comparing equal elements") {
+         jaxbElement.shouldBeEqualToComparingFields(jaxbElement)
+      }
+
+      test("!should fail when comparing different elements") {
+         shouldFail {
+            jaxbElement.shouldBeEqualToComparingFields(otherJaxbElement)
+         }.message.shouldContain(
+            """Value differ at:\s+1\) value:\s+expected:<124> but was:<123>""".toRegex()
+         )
+      }
+   }
+})