WrappedSerialDescriptor.equals doesn't work

[kuanyingchou]

Describe the bug

Hi, I hit this while creating a generic custom serializer with our format-specific type support. My descriptor is like this

override val descriptor: SerialDescriptor = SerialDescriptor("android.util.SparseArray", surrogateSerializer.descriptor)

And I can't compare it in encodeSerializableValue as the comparison seems to be instance based.

To Reproduce
Attach a code snippet or test data if possible.

val a = SerialDescriptor("android.util.SparseArray", surrogateSerializer.descriptor)
val b = SerialDescriptor("android.util.SparseArray", surrogateSerializer.descriptor)
assertThat(a).isEqualTo(b)

Expected behavior

The test should pass, but I got:

java.lang.AssertionError: expected:<kotlinx.serialization.descriptors.WrappedSerialDescriptor@a47353e> but was:<kotlinx.serialization.descriptors.WrappedSerialDescriptor@e7ebf9f>
at org.junit.Assert.fail(Assert.java:89)

Environment

• Kotlin version: 2.0.20
• Library version: 1.8.0
• Kotlin platforms: Android
• Gradle version: 8.9