[issue40421] [C API] Add getter functions for PyFrameObject and maybe move PyFrameObject to the internal C API

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Ned Batchelder:
> I went ahead and changed the coverage.py code to this: (...)

I proposed a coverage PR using PyObject_GetAttrString(frame, "f_lasti") which should works on all Python versions:
https://github.com/nedbat/coveragepy/pull/1331

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