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

[STINNER Victor]

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

It's unclear to me if the ability to read directly the PyFrameObject.f_lineno member is a deliberate use case, or if we should enforce the usage of PyFrame_GetLineNumber().

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<https://bugs.python.org/issue46356>
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