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* The resolution of DR 25 requires undefined behaviour.
What makes you think that?
Well, the fixed text reads as if by calling os.rdbuf()->sputn(str.data(), n), [...] where n is the larger of os.width() and str.size(); If n is larger than str.size(), then sputn will read past the end of the array returned by str.data(). Or maybe padding should modify str, but that is also undefined, since str is const.
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