Feature Request - detect key of wrong type passed to Map.get() or Map.remove()

Since the signature of these methods, by design, does not constrict you to use the generic type of the key, and is just `Object`, it is easy to accidentally pass the wrong variable.

This is especially true for remove(), which in the case of cache clean-up code, might not have full test coverage, or missing/difficult to assert behaviour. This has been seen to lead to leaked memory.