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

[Alexander Belopolsky]

Alexander Belopolsky <alexander.belopolsky at gmail.com> added the comment:

I submitted PR 4079. Serhiy, please review the logic and if this matches what we discussed a year ago, I will add the docs and NEWS entries.

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