[issue28254] Add C API for gc.enable, gc.disable, and gc.isenabled

[da-woods]

da-woods <dw-git at d-woods.co.uk> added the comment:

Cython currently does an elaborate process of importing the GC module and loading the "isenabled", "enable" and "disable" attributes each time it creates a cdef type

https://github.com/cython/cython/blob/master/Cython/Utility/ExtensionTypes.c#L73-L107

Admittedly that's partly because it's abusing the Py_TPFLAGS_HEAPTYPE to allow multiple inheritance where Python doesn't really allow it.

But the up-shot is that Cython definite has a use-case for doing this directly in the C API, and would use these functions if provided.

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nosy: +da-woods

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