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kotlinlang

Hi all, does anyone know how to make a `JsonConfiguration(classDiscriminator = "customType")` work only for a particular class? For instance, let’s say I have something like:
```
@Serializable
data class MyClass(
  @Polymorphic
  val polymorphicA: PolymorphicA,
  @Polymorphic
  val polymorphicB: PolymorphicB
)
```
And I’m serializing/deserializing an instance of `MyClass`. I want to serialize/deserialize `polymorphicA` using the default `classDiscriminator` which is `type`. However, I want to serialize/deserialize `polymorphicB` using a custom `classDiscriminator`, say `customType`. I don’t think the steps outlined in <https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/polymorphism.md#a-bit-of-customizing> showcase that level of granularity (i.e. if a custom `classDiscriminator` is specified, it’s applied to all of `MyClass`, which is not what I want).

<https://github.com/Kotlin/kotlinx.serialization/issues/546>

My current work-around is a custom serializer.