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kotlinlang

Hi guys. I need some help.
```val module = SerializersModule {
    polymorphic(Project::class) {
        subclass(OwnedProject::class)
    }
}```
So, I was looking into <https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/polymorphism.md#open-polymorphism|Open polymorphism> and can’t get it working for me.
For some reason it only works when I have two levels, like in the example from above. How to init SerializersModule in case I have 3+ levels (e.g. OwnedProject is parent of OwnedChildeProject)?

Simply call `polymorphic` several times. You can use a loop for that: <https://github.com/Kotlin/kotlinx.serialization/blob/c041c2c92b96c353958843be78084bfd3a4fc1de/formats/json/commonTest/src/kotlinx/serialization/features/PolymorphicOnClassesTest.kt#L66>