What do you think about the following: I have a cl...

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[kirillrakhman]

What do you think about the following: I have a class MyList<T> that inherits from java.util.AbstractList<T>. Because that's a java class, instances of my class always appeared as MyList<T!> and myList.get(0) returned an instance of T! even when I declared it as MyList<T>(). To fix this, I also let my class implement kotlin.collections.List<T>, now myList.get(0) returns instances of T which is great. What's weird, however, I that I still can invoke myList.indexOf(null). Also, I can call myList.add(null) which will crash at runtime (AbstractList implements it to throw). I can kinda understand this behavior because the methods are present in `MyList`'s super class hierarchy. Still, it makes dealing with my class a little bit dangerous. I guess my questions comes down to, whether the stdlib should provide an abstract class that you extend if you want to have your own List type.