operator[] returns by value

[feazeyu]

In my opinion, this behavior is very counterintuitive and the operator[] should return a reference instead, or it should be explicitly stated that jValue objects are intended as readonly.

As of now, the methods to modify jValue objects are public, thus semantically telling us that we should be able to modify them, however once you try to modify any values, you run into the issue of not being able to get a pointer to it.

Please fix the semantics or make the return be a reference instead of a value