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'PyStopIteration_Create' is just a trivial wrapper:
PyObject *
PyStopIteration_Create(PyObject *value)
{
 return PyObject_CallFunctionObjArgs(PyExc_StopIteration, value, NULL);
}
It is not needed.
As for 'PyGen_FetchStopIterationValue', does it really need to be public? It is trivial to make it private because all calls to it are in 'genobject.c'. However, I am not sure if there is a strong use case for having it public.