[Issue 12547] floor/round/ceil that optionally return a specified integral type

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12547

--- Comment #1 from Don <clugdbug at yahoo.com.au> ---
FYI: They are defined to return floating-point values because that's what the
equivalent C functions do. They should not be modified.

Note that if you cast them to integers, you have to worry about overflow. So
that's more complicated.

Note also the existence of rndint() and rndlong().

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