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difflib.SequenceMatcher.find_longest_match return wrong result #134116

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pendingThe issue will be closed if no feedback is providedstdlibPython modules in the Lib dirtype-bugAn unexpected behavior, bug, or error
@unisgn

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@unisgn

Bug report

Bug description:

Python 3.13.3 (main, Apr 9 2025, 07:44:25) [GCC 14.2.1 20250207]

importdifflibs1='TZiSLutKO5xRiAkkw1ZGkpZsq4's2='hTkmKeyY0WYoEqn7xD6jDRwRU4quqozyh8WFwkYY82h9wVv93iUzijw4Q8JYh4l496RD20dsTmy1T0Tl5D1sLRetaW2PP75f9fLeSCllRmISdDFLb3QazkubtOAjZ95a5Ril7NdVIX8hJWlJgwmhd7FGlO5aQQQbLeQcSEFqmiDZOnBWoAisj9YeKHiihm2QzAsdZAN78CO8tXEHfKjCOoZWQo513tEJ4b26BRItK'm=difflib.SequenceMatcher(None,s1,s2).find_longest_match(ahi=len(s1),bhi=len(s2))asserts1.find('tK')==6assertlen(s2)==233asserts2.find('tK')==231assertm==difflib.Match(3,100,1)

CPython versions tested on:

3.13

Operating systems tested on:

Linux

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    pendingThe issue will be closed if no feedback is providedstdlibPython modules in the Lib dirtype-bugAn unexpected behavior, bug, or error

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