changes.swift

struct Changes<Wrapped> {
    private var version: UInt = 0
    var value: Wrapped {
        didSet { version += 1 }
    }
    
    init(_ value: Wrapped) {
        self.value = value
    }
    
}
extension Changes: Equatable {
    static func == (lhs: Changes<Wrapped>, rhs: Changes<Wrapped>) -> Bool {
        return lhs.version == rhs.version
    }
}