[swift-evolution] [Proposal] Add floor() and ceiling() functions to FloatingPoint

[Stephen Canon]

> On Jun 29, 2016, at 1:10 PM, Matthew Johnson <matthew at anandabits.com> wrote:
> 
> My criticism of the 'toNearestOrGreatest' still stands though.  I think this name is misleading given the stated semantics.  The name indicates "greater value" not "greater magnitude" which are opposites in the case of negative numbers.

Yup, I agree.  I think I originally suggested `toNearestTiesAway`.  I’m not tied to that name specifically, but we should be clear that ties go away from zero, not up.
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