Makes the Result type in Swift conform to Codable

Result+Codable.swift

import Foundation

extension Result: Codable where Success: Codable, Failure: Codable {

    public init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        switch try container.decode(ResultType.self, forKey: .type) {
        case .success:
            self = .success(try container.decode(Success.self, forKey: .value))
        case .failure:
            self = .failure(try container.decode(Failure.self, forKey: .value))
        }
    }

    public func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)
        switch self {
        case .success(let value):
            try container.encode(ResultType.success, forKey: .type)
            try container.encode(value, forKey: .value)
        case .failure(let error):
            try container.encode(ResultType.failure, forKey: .type)
            try container.encode(error, forKey: .value)
        }
    }

    enum CodingKeys: CodingKey {
        case type
        case value
    }

    enum ResultType: Codable {
        case success
        case failure
    }
}