AnyCodale.swift

extension AnyCodable: Codable {
    
    public init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        if let intValue = try? container.decode(Int.self) {
            self._box = _ConcreteCodableBox<Int>(intValue)
        } else if let doubleValue = try? container.decode(Double.self) {
            self._box = _ConcreteCodableBox<Double>(doubleValue)
        } else if let floatValue = try? container.decode(Float.self) {
            self._box = _ConcreteCodableBox<Float>(floatValue)
        } else if let stringValue = try? container.decode(String.self) {
            self._box = _ConcreteCodableBox<String>(stringValue)
        } else if let dictionaryValue = try? container.decode([String:AnyCodable].self) {
            self._box = _ConcreteCodableBox<[String:AnyCodable]>(dictionaryValue)
        } else if let arrayValue = try? container.decode([AnyCodable].self) {
            self._box = _ConcreteCodableBox<[AnyCodable]>(arrayValue)
        } else {
            throw DecodingError.typeMismatch(
                type(of: self),
                .init(
                    codingPath: decoder.codingPath,
                    debugDescription: "Unsupported JSON type"
                )
            )
        }
    }

    public func encode(to encoder: Encoder) throws {
        // Safe to use `as!` becasue the `_base` is just `_baseCodable`
        try (self._box._base as! Codable).encode(to: encoder)
    }
}