[issue1869] Builtin round function is sometimes inaccurate for floats

[Mark Dickinson]

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

I take that back.  The 2.7 round still has some problems.
Here's one example:

>>> x = 5e15 + 1  # exactly representable as an IEEE 754 double
>>> x
5000000000000001.0
>>> round(x)
5000000000000002.0

Another nit:

>>> round(-0.0, 0)  # should retain the sign of zero
0.0

Reopening.

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resolution: fixed -> 
status: closed -> open

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<http://bugs.python.org/issue1869>
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