Property getter setting current node data

GetAs(...) method is very dangerous, because it may replace (or rather, clear) current data in node if FKind mismatched.
There should be no value setting in getter method

GetAs is designed to overwrite the type if there is a mismatch. That's by design.

well, fine, if that's the case. But i still feel somewhat weird to try "get" something, i don't get what i want (because of logical error, i can accept that) and forever losing what i try to get for