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7e7e88f674 [3.13] gh-156444: Fix a negated character set with IGNORECASE and LOCALE (GH-156445) (GH-156458)
charset_loc_ignore() tested the whole set once per locale case and took
the disjunction, which complements a set before closing it under case
instead of after: [bc] matched b'B', but so did [^bc].  Match both cases
of the character against every set member instead.
(cherry picked from commit 6671d27327)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-27 11:40:52 +00:00
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