[issue46356] [C API] Enforce usage of PyFrame_GetBack()

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

f_lineno is not part of the API. No field in PyFrameObject is.

I don't know how we can stop people from using them though.

If they don't know better than pulling data out of undocumented internal struct, then I'm not sure an underscore prefix is going to help.
It won't do any harm, though.

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