[issue28292] Make Calendar.itermonthdates() behave consistently in edge cases

[Alexander Belopolsky]

Changes by Alexander Belopolsky <alexander.belopolsky at gmail.com>:


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dependencies: +calendar.prcal(9999) output has a problem, calendar: OverflowErrors for year == 1 and firstweekday > 0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28292>
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