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kotlinlang

Yeah, I think I'll test out the milestone. It's such a pain to implement the abstract class. I just want some type information for readability, I don't really want to change the type I'm using.

The actual usecase is:

```
@GET
@Path("...")
fun getUser(...): Response = User("Vegard").toResponse()
```

I want that `Response` to have the type info of the actual object I return to the frontend. It's currently somewhat painful to figure out the actual type of whats being returned. (edit: Response being `java.ws.rs.core.Response`)