[FEATURE] Allow defining a sealed class as a subclass of an open polymorphic class #2782
Description
What is your use-case and why do you need this feature?
I have an open interface, say MyOpenInterface.
I have an implementation of this open interface which is sealed i.e. sealed class MySealed: MyOpenInterface { ... }.
Currently, it seems the only way to define the SerializersModule is to explicitly list all the subtypes of the sealed class:
polymorphic(MyOpenInterface::class) {
subclass(MySealedSub1::class)
subclass(MySealedSub2::class)
...
}
This was raised on Slack, but no alternative options were provided by anyone.
Describe the solution you'd like
I would like to define a SerializersModule as follows, which would make the module type-safe:
polymorphic(MyOpenInterface::class) {
subclass(MySealed::class)
}At the moment, attempting to do this results in an error like this:
Serializer for MySealed can't be registered as a subclass for polymorphic serialization because its kind SEALED is not concrete. To work with multiple hierarchies, register it as a base class.