Serhiy Storchaka added the comment:
PyArg_UnpackStack() is declared as in the limited API since 3.3. If you want to
add PyArg_UnpackStack() to the limited API, define it as added in 3.7.
For compatibility with extensions built with older Pythons you should define
new type flag and read tp_fastcall only if the flag is set. See for example
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