Comparable and FloatingPoint types

Evolution Pitches
17

Yeah, eventually I think we want to have explicit syntax for "namespacing" declarations and references, which would supersede the need for @_implements, e.g.:

struct MyFloat {
  static func Equatable.==(l: MyFloat, r: MyFloat) -> Bool { /* total equality */ }
  static func Numeric.==(l: MyFloat, r: MyFloat) -> Bool { /* IEEE equality */ }
}

let totallyEqual = Equatable.==(x, y)
let floatallyEqual = Numeric.==(x, y)
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