/// A list of Keys used to persist data
enum DefaultsKey: String {
    case game = "Game"
}
/// A type providing DAO services for `UserDefaults` persistence.
protocol DefaultsServiceType {
    /// Read & decode a value for a given key from standard `UserDefaults`.
    ///
    /// - Parameter forKey: Defaults key to be read.
    /// - Returns: Decoded value if possible. `nil` if not present in standard defaults or if decoding threw an error.
    func read<T: Decodable>(forKey: DefaultsKey) -> T?
    /// Encode & write a value to a give key in standard `UserDefaults`.
    ///
    /// If encoding the given value failed, existing value -if any- will be erased.
    ///
    /// - Parameters:
    ///   - value: Value to encode and write to defaults.
    ///   - forKey: Defaults key to write to
    func write<T: Encodable>(_ value: T, forKey: DefaultsKey)
    /// Erase a value for a given key -if present- from standard `UserDefaults`.
    ///
    /// - Parameter key: Defaults key to erase.
    func erase(_ key: DefaultsKey)
}