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kotlinlang

Hi there, I'm using Retrofit with Serialization on Android.
I'm trying to parse a Json object which contains a `data` object. The type of `data` is defined by `isTypeA` or `isTypeB` within the object itself. (See sample in thread).

I was thinking about using a sealed class. Is there a way to specify using annotations that the type of the object should be defined by a value within that object?

Sample:
```{
  "data": {
    "isTypeA": 1
    ...
  }
}```
```{
  "data": {
    "isTypeB": 1
    ...
  }
}```

<https://kotlinlang.org/api/kotlinx.serialization/kotlinx-serialization-json/kotlinx.serialization.json/-json-content-polymorphic-serializer/|JsonContentPolymorphicSerializer>

Mmh, turns out as useful as JsonContentPolymorphicSerializer is, it doesn't seem to support nullable types