Actually, this isn't quite the whole story. Most everyone follows the IEEE convention of "round towards nearest or even."
I'm aware of that - but it wasn't applicable in this case. Btw, (s)printf doesn't seem to get it right:
printf "%.15f", 0.5; # prints 0.500000000000000
printf "%.0f", 0.5; # prints 1 and should print 0
and 0.5 can
be represented exactly ...
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