[issue17494] References to stack bottom are confusing

[anatoly techtonik]

anatoly techtonik added the comment:

+or None if this is the first frame (at the bottom of the stack);

I'd avoid top/bottom altogether, but if it is what is needed to reach the consensus then I am fine with that.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17494>
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