[issue47164] [C API] Add private "CAST" macros to clean up casts in C code

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

After reading Mark's comments, I reworked my GH-32190 PR to only use the CAST macros in other macros, not in the C code. The CAST macros are not used in such code pattern:

     else if (PyCFunction_Check(func))
-        return ((PyCFunctionObject*)func)->m_ml->ml_name;
+        return _PyCFunctionObject_CAST(func)->m_ml->ml_name;

In fact, this change doesn't bring any value.

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