gh-154387: validate `PyStructSequence_Desc` field invariants#154684

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XuehaiPan wants to merge 3 commits into

python:mainfrom

XuehaiPan:fix-structseq-validate-desc

Commits on Jul 25, 2026

fix(structseq): validate PyStructSequence_Desc field invariants
XuehaiPan
committed
fix(structseq): reject negative n_in_sequence and fix int format specifiers
XuehaiPan
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fix: remove `test_` prefix for functions in `_testcapi`
XuehaiPan
committed