[swift-evolution] Add a `clamp` function to Algorithm.swift

[Nevin Brackett-Rozinsky]

I’d be on board with an extension of Comparable so you could write
“16.clamped(to: 0...10)”. Something along the lines of:

extension Comparable {
    func clamped(to range: ClosedRange<Self>) -> Self {
        return max(range.lowerBound, min(self, range.upperBound))
    }
}

Nevin
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