Boundary implementation through extending Comparable protocol

ComparableBoundary.swift

extension Comparable {
    func insideBoundary(a : Self, _ b : Self) -> Bool {
        let (left, right) = (min(a,b), max(a, b))
        return self >= left && self <= right
    }
    func insideBoundary(inclusive a : Self, exclusive b : Self) -> Bool {
        return insideBoundary(a, b) && self != b
    }
    func insideBoundary(exclusive a : Self, exclusive b : Self) -> Bool {
        return insideBoundary(inclusive: a, exclusive: b) && self != a
    }
}

10.insideBoundary(10, 50)
10.insideBoundary(inclusive: 10, exclusive: 50)
10.insideBoundary(inclusive: 50, exclusive: 10)
10.insideBoundary(exclusive: 10, exclusive: 50)