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Add issue header

Expose Py_SIZE, Py_IS_TYPE, Py_SET_SIZE as functions in the Stable ABI #9558

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Expose Py_SIZE, Py_IS_TYPE, Py_SET_SIZE as functions in the Stable ABI

Expose Py_SIZE, Py_IS_TYPE, Py_SET_SIZE as functions in the Stable ABI #9558

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