如何将包含数组的Swift对象自定义编码为JSON？

struct Person: Codable {
    let name: String
    let age: Int
}

struct MyObject: Codable {
    let id: String
    let numbers: [Int]
    let people: [Person]
    
    // 自定义编码器
    struct MyEncoder: Encoder {
        var codingPath: [CodingKey] = []
        var userInfo: [CodingUserInfoKey: Any] = [:]
        var container: KeyedEncodingContainer<MyCodingKey>
        
        init(container: KeyedEncodingContainer<MyCodingKey>) {
            self.container = container
        }
        
        func container<Key>(keyedBy type: Key.Type) -> KeyedEncodingContainer<Key> where Key : CodingKey {
            return container as! KeyedEncodingContainer<Key>
        }
        
        func unkeyedContainer() -> UnkeyedEncodingContainer {
            return container.nestedUnkeyedContainer()
        }
        
        func singleValueContainer() -> SingleValueEncodingContainer {
            return container.nestedSingleValueContainer()
        }
    }
    
    struct MyCodingKey: CodingKey {
        var stringValue: String
        
        init?(stringValue: String) {
            self.stringValue = stringValue
        }
        
        var intValue: Int? { return nil }
        init?(intValue: Int) { return nil }
    }
    
    // 编码函数
    func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: MyCodingKey.self)
        try container.encode(id, forKey: MyCodingKey(stringValue: "id")!)
        
        var numbersContainer = container.nestedUnkeyedContainer(forKey: MyCodingKey(stringValue: "numbers")!)
        for number in numbers {
            try numbersContainer.encode(number)
        }
        
        var peopleContainer = container.nestedUnkeyedContainer(forKey: MyCodingKey(stringValue: "people")!)
        for person in people {
            try peopleContainer.encode(person)
        }
    }
}

let object = MyObject(id: "12345", numbers: [1, 2, 3], people: [Person(name: "Alice", age: 25), Person(name: "Bob", age: 30)])

let jsonEncoder = JSONEncoder()
jsonEncoder.outputFormatting = .prettyPrinted

do {
    let jsonData = try jsonEncoder.encode(object)
    if let jsonString = String(data: jsonData, encoding: .utf8) {
        print(jsonString)
    }
} catch {
    print("Failed to encode object as JSON: \(error)")
}