What are you worried about? An order of magnitude is not a slight performance penalty. The C++ standard library is vast and we've had c++98, c++03 and c++11 in

What are you worried about? An order of magnitude is not a slight performance penalty. The C++ standard library is vast and we've had c++98, c++03 and c++11 in the 15 or so years. There's few enough parts of it that you'll revisit regularly. You can't go around expecting people to be experts in the minutiae of all of it.