I havent looked at the bytecode, but I think you a...

# tornadofx

[elexx]

I havent looked at the bytecode, but I think you are right about T is MyEvent. Any is just the upper bound if you didn't specify one, like so: class MyEvent<out T : Number>(val param: T) : FXEvent() and subscribe with subscribe<MyEvent<Number>>. But I guess there is no benefit to just declaring the event class like class MyEvent(val param: Number) : FXEvent()