I'm impressed by the humility here from someone who (a) is writing a library to replace core traceback behavior in pypi; (b) has doubtless read both cpython and

I'm impressed by the humility here from someone who (a) is writing a library to replace core traceback behavior in pypi; (b) has doubtless read both cpython and pypi code; (c) nevertheless writes "While I have some general idea of how the CPython interpreter works, I absolutely do not understand well enough to claim with absolute certainty how this situation arise". Jeepers, who WOULD be qualified to explain for sure how this works?