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

[Björn Forster]

Hello Karl and everyone else involved,
an IEEE754 conform floating point implementation requires also squrt and a
remainer function being provided by the respective float implementation.
Shouldn't these two be also added to the FloatingPoint protocol now that
the rounding functions are being added?

Kind Regards,
Björn
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