3.13.2: cast in Py_XDECREF causes runtime failures with immortal objects

Bug report

Bug description:

In Python 3.13.2 I use

Py_XDECREF(PyObject *op) 

It is called at the end of a function-call to load an image (cv2.imread) which fails, resulting in a None value (not NULL!). For Python 3.9 Py_XDECREF works just fine, without crash. For Python 3.13.2 the program, compiled with VS2022 (64 Bit), raises a "Run-Time Check Failure #1 - A cast to a smaller data type has caused a loss of data." and my application crashes ("/RTC1 = Basic Runtime Checks enabled").

I followed up the calls:

    Py_DECREF
        _Py_IsImmortal
            #elif SIZEOF_VOID_P > 4
                _Py_CAST(PY_INT32_T, op->ob_refcnt)     <-- crash

The value is

op->ob_refcnt == 0x0000000100000000

To fix this problem, I propose, that the type cast to 32 bit should be changed to

_Py_CAST(PY_INT32_T, op->ob_refcnt & 0xFFFFFFFF)

CPython versions tested on:

3.13

Operating systems tested on:

Windows

Comience en la ruta de llamada de Py_XDECREF/Py_DECREF y _Py_IsImmortal, reproduciendo el fallo de Windows VS2022 /RTC1 con el recuento de referencias immortal indicado. Compare el comportamiento del cast con el enmascarado propuesto y, después, verifique que el fallo se ha resuelto mediante las pruebas pertinentes de CPython; el issue no especifica ningún archivo fuente ni prueba concretos.