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kotlinlang

hello everyone. kotlinx.serialization question.
let’s say that I want to have `sealed class Letter` and subclasses `A, B, C, Unknown`. I define default deserializer like this:
```SerializersModule {
    polymorphic(Letter::class) {
        defaultDeserializer { Letter.Unknown.serializer() }
    }
}```
*BUT*
I want to define custom `KSerializer` for `B`.
how should I do this?

I tried something like this
```SerializersModule {
    polymorphic(Letter::class) {
        subclass(Letter.B::class, BSerializer())
        defaultDeserializer { Letter.Unknown.serializer() }
    }
}```
but that doesn’t work it doesn’t use `BSerializer` at all and tries to do default json fields/elements mapping.
It’s not working when I set deserializer like this `@Serializable(with = BSerializer)`