[issue17259] Document round half to even rule for floats

[alexd2]

alexd2 added the comment:

I encountered the same inconsistent behavior. That is, I don't get the same rounding from the two following commands:

print "%.f %.f" %(0.5, 1.5)               # Gives --> 0 2
print "%.f %.f" %(round(0.5), round(1.5)) # Gives --> 1 2

I also get:
print round(0.5), round(1.5) # Gives --> 1.0 2.0

>From what I read in the thread it seems to be more like a bug rather than something to just be documented, right?

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nosy: +alexd2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17259>
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