The tp_clear field of PyTypeObject has type inquiry. It is a pointer to
a function that takes PyObject * and return int.
typedef int (*inquiry)(PyObject *);
I'm interesting what the result of this function means. In what cases it
can return non-zero, and can it set an exception?
Currently tp_clear() is called in a single place, and its result is
ignored. All tp_clear implementations in the stdlib always return 0.
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