[issue5473] round(float, ndigits<0) sometimes rounds to odd

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Actually the negative n case *is* quite different from the positive n,
although I think it's fair to say that the issue 1869 title covers both 
cases fairly well. :)

It's not at all hard to make sure that round(x, -n) correct for -22 <= -n 
<= 0 and any finite x, using the fact that the remainder fmod(x, 10.0**-n) 
is exactly representable as a float.  I'll try to find time to implement 
this before 3.1.  Positive n is still tricky, though.

Anyway, I'm going to close this and fold the discussion into issue 1869.
Thanks for the report!

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status: pending -> closed

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