When a custom serializer is specified on a type and this type is used in a property of another serializable class, then on the JVM this leads to an error accessing the custom serializer class - because it is private and located in another package.
Fixes https://github.com/Kotlin/kotlinx.serialization/issues/2495
Merge-request: KT-MR-12877
Merged-by: Sergei Shanshin <Sergey.Shanshin@jetbrains.com>
Sergey.Shanshin