Why do I get plenty of errors when trying to conform class to Codable? class Order: ObservableObject, Codable {          enum CodingKeys: CodingKey {            case  name        }     required init(from decoder: Decoder) throws {         let container = try decoder.container(keyedBy: CodingKeys.self)         name = try container.decode(String.self, forKey: .name)     }     func encode(to encoder: Encoder) throws {         var container = encoder.container(keyedBy: CodingKeys.self)         try container.encode(name, forKey: .name)     }          var didChange = PassthroughSubject<Void,Never>()          static let types = ["Vanilla","Chocolate", "Strawberry", "Rainbow"]          @Published var type = 0 { didSet { update() } }          @Published var quantity = 3 { didSet { update() } }     @Published var specialRequests = false { didSet { update() } }     @Published var extraSprinkles = false { didSet { update() } }     @Published var extraFrosting = false { didSet { update() } }          @Published var name = ""  { didSet { update() } }     @Published var city = ""{ didSet { update() } }     @Published var streetAddress = ""{ didSet { update() } }     @Published var zip = ""{ didSet { update() } }          @Published var isValid = true{ didSet { update() } }          func update(){         didChange.send(())     }