kindaequatable.swift

protocol KindaEquatable {
    func ~==(lhs: Self, rhs: Self) -> Bool
}

infix operator ~!= { associativity left precedence 140 }
func ~!=<T where T: KindaEquatable>(lhs: T, rhs: T) -> Bool {
    return !(lhs ~== rhs)
}

// MARK: - String

extension String: KindaEquatable {}

infix operator ~== { associativity left precedence 140 }
func ~==(lhs: String, rhs: String) -> Bool {
    return lhs.lowercaseString == rhs.lowercaseString
}