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I have a use case that involves both polymorphism and unwrapping.  Specifically, trying to model the `JSON Schema` concept as a data class, there are a few properties which are union types. For example, (`null`, `boolean`, `schema` ) or (`null`, `string`, `list&lt;string&gt;`)

It seems like I'd have to write a rather complex set of custom Serializers to do this properly, in what feels like it should be achievable with a more declarative approach.

Can you provide a simple example? I think that will be needed for any good advice

Literally the spec for openapi JSON Schema. 