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gh-111178: fix UBSan failures in Modules/_collectionsmodule.c #129773

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@picnixz picnixz commented Feb 7, 2025

This PR fixes the UBSan failures and addresses some minor cosmetic changes. PEP-7 changes were not applied since they could scramble the diff but other semantic changes affecting the signature of touched functions may have been done.

@picnixz picnixz changed the title gh-111178: fix UBSan failures in $where gh-111178: fix UBSan failures in Modules/_collectionsmodule.c Feb 7, 2025
@picnixz picnixz marked this pull request as ready for review February 7, 2025 18:06
@picnixz picnixz requested a review from rhettinger as a code owner February 7, 2025 18:06
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picnixz commented Feb 7, 2025

Ah I'm sorry I put this one as ready for review but I learned that _ + capital letter was also UB (#128248 (comment)). Even though _ + lowercase letter is not UB (hopefully), this one can be reviewed. However, for consistency, I'll also remove the _ tomorrow along with the other PRs.

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