6a72b0e607
- as seen in #3201, using count() based on the ostringstream tellp is not reliable since it is not updated with reset or copying. STYLE: minor changes to string/char/span streams - update docs to only mention string_view - use auto return, without extra trailing 'decltype' ENH: add IOstream size check helper methods * checkNativeSizes() : test only * fatalCheckNativeSizes() : an assert with FatalIOError