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`_struct.c`: Fix UB from integer overflow in`prepare_s`#145158

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Merged

gpshead merged 2 commits intopython:mainfromStanFromIreland:struct-overflow

Feb 24, 2026

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`_struct.c`: Fix UB from integer overflow in`prepare_s`#145158

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succeededFeb 23, 2026 in 37s

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