gh-111178: fix UBSan failures in Modules/_struct.c
#129793
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Ah I'm sorry I put this one as ready for review but I learned that _ + capital letter was also UB (#128248 (comment)) so I'll fix them tomorrow. |
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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.