As you all know, it’s “impossible” in Kotlin to add actual state to a final class in a mixin-like-fashion. Well, apparently there is a way. The simplest way to think of how to achieve this is to just have a map that maps between the object and the value of the specific property that you want to add. The problem with that is that it prevents gc on the actual object, which is obviously a HUGE performance impact. But, we can still use weak references with almost no overhead. So… here’s the code and...