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gh-148663: Document that `calendar.IllegalMonthError` inherits from both `ValueError` and `IndexError` (#148664)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Stan Ulbrych <stan@python.org>
E
Eoin Shaughnessy committed
435be06dd25a5e4e19014340c4ba873d71051c4c
Parent: 0469e6d
Committed by GitHub <noreply@github.com> on 4/23/2026, 2:50:23 PM