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Thanks for the feedback; I've added 2.6, 2.7, 3.1 to the
versions and will backport.
[Eric]
> Since you're calling int() on the result, can't this code:
> self._int = str(int((intpart+fracpart).lstrip('0') or '0'))
> just be:
> self._int = str(int(intpart+fracpart))
> ?
Yes! Thank you. I'm not sure what (if anything) I was thinking here.
The str(int(...)) hack is quite an ugly way to normalize a string; it 
also has the drawback of taking time quadratic in the length of the 
input. In its defence: (a) I can't think of anything better; (b) this 
change seems to have no noticeable effect on the time to run the test-
suite, and (c) since all the arithmetic operations use string <-> int 
conversions anyway the quadratic time behaviour doesn't really make 
things any worse than they already are.
> And here, you already know diag is not None, so do you need the "or 
'0'"
> part?
> self._int = str(int(diag or '0')).lstrip('0')
I think *something* like this is needed, since diag can legitimately be 
the empty string. It might be clearer as a proper if block, though: 
'if diag: ... else: ...'.