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PyType_FromSpec() is a convenient function to create types dynamically in C extension modules, but its usefulness is limited by the fact that it creates new types using the default metaclass.
I suggest adding a new C API function
PyObject *PyType_FromSpecEx(PyObject *meta, PyType_Spec *spec)
and redefine PyType_FromSpec() as
PyType_FromSpecEx((PyObject *)&PyType_Type, spec)
This functionality cannot be implemented by user because PyType_FromSpec requires access to private slotoffsets table.
A (trivial) patch attached.