[rfc] rint() rounds to even

[Ben Collins]

I have a bug report which I am not sure is a bug or a feature that is
just misunderstood. The rint() function appears to round towards even
numbers. IOW, rint(1.5) and rint(2.5) both return "2.0", aswell
rint(3.5) and rint(4.5) both return "4.0".

Now my math may be a little rusty and old, but I always assumed that
"n.5" always rounded to "n+1". Is this not the case for standard math
functions? If so, is this documented somewhere?

Ben

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