Serhiy Storchaka added the comment: Yes, the current documentation is an impossibility (unless we remove all date limits that is much harder issue). Raisin OverflowError will make the implementation of itermonthdays2() and itermonthdays() more complex. Yielding dummy instances or None requires rewriting user code (less with a dummy instance if we are lucky). I agree that in long perspective yielding None looks better.
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