Ezio Melotti added the comment: Using "first" makes some sense, since it's talking about "previous", but I agree it might be confused with the top frame too. What about this wording then: -f_back is to the previous stack frame (towards the caller), -or None if this is the bottom stack frame; +f_back is to the previous stack frame (towards the caller), +or None if this is the first frame at the bottom of the stack;
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