Codable JSON type in Swift

JSON.swift

enum JSON {
    case number(Double)
    case boolean(Bool)
    case string(String)
    case array([JSON])
    case object([String: JSON])
    case null
}

extension JSON: Codable {
    init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        if let value = try? container.decode(Double.self) {
            self = .number(value)
        } else if let value = try? container.decode(Bool.self) {
            self = .boolean(value)
        } else if let value = try? container.decode(String.self) {
            self = .string(value)
        } else if let value = try? container.decode([JSON].self) {
            self = .array(value)
        } else if let value = try? container.decode([String: JSON].self) {
            self = .object(value)
        } else if container.decodeNil() {
            self = .null
        } else {
            throw DecodingError.dataCorrupted(.init(codingPath: decoder.codingPath, debugDescription: "Failed to interpret as a JSON value.", underlyingError: nil))
        }
    }
    
    func encode(to encoder: Encoder) throws {
        var container = encoder.singleValueContainer()
        switch self {
        case .number(let value):
            try container.encode(value)
        case .boolean(let value):
            try container.encode(value)
        case .string(let value):
            try container.encode(value)
        case .array(let value):
            try container.encode(value)
        case .object(let value):
            try container.encode(value)
        case .null:
            try container.encodeNil()
        }
    }
}