BUG: fix free-threaded PyObject layout in replace_scalar_type_names helper (#30686)#30702
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charris merged 1 commit intonumpy:maintenance/2.4.xfrom Jan 21, 2026
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00 - Bug
04 - Documentation
08 - Backport
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Backport of #30686.
Fixes #30681.
This function models the layout of PyObject and pokes at it via ctypes. It was poking at bits outside of
tp_nameon the free-threaded build. The fix is to model PyObject correctly on free-threading.The layout of PyObject is different on 3.13t but the size is the same so this should still work there. I tested on 3.14.2t.