custom_coding_key_scaffold.swift

enum CodingKeys: CodingKey {
     case template
     case dynamic(String)

     init?(stringValue: String) {
         switch stringValue {
         case "template":
             self = .template
         case stringValue where Scaffold.attributes.contains(stringValue):
             self = .dynamic(stringValue)
         default:
             return nil
         }
     }

     var stringValue: String {
         switch self {
         case .template:
             return "template"
         case let .dynamic(name):
             return name
         }
     }

     // Not used
     var intValue: Int? { nil }
     init?(intValue _: Int) { nil }
}