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Add issue header

PyObject_Realloc(NULL, size) crashes free-threaded 32-bit Python 3.15.0b2 #12644

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PyObject_Realloc(NULL, size) crashes free-threaded 32-bit Python 3.15.0b2

PyObject_Realloc(NULL, size) crashes free-threaded 32-bit Python 3.15.0b2 #12644

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