Avoid obsolescent features in push_iterator
#4
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std::iteratoris deprecated in C++17 (see cppreference and P0174R2). It's better to explicitly provide the member typedef-names and avoid inheritance._Is_checked_helperbecame meaningless since VS 2017 15.8/19.15. Removal of it is planned in<xutility>: What's the intent of the pseudo-documentation? microsoft/STL#5081. I think we should stop using it for newer versions of MSVC.