Result+Data.swift

public protocol DecodableDataDecoder {
    func decode<T>(_ type: T.Type, from data: Data) throws -> T where T: Decodable
}

extension JSONDecoder: DecodableDataDecoder {}
extension PropertyListDecoder: DecodableDataDecoder {}

public extension Result where Success == Data {
    func decode<T: Decodable>(_ type: T.Type, using decoder: DecodableDataDecoder) -> Result<T, Error> {
        do {
            return .success(try decoder.decode(type, from: try get()))
        } catch {
            return .failure(error)
        }
    }
}