当发送一个dictionary对象时,如果该对象包含使用Swift中的Alamofire的dictionary对象数组,就会发生奇怪的行为?

let data: [String: Any] = [
    "array1": [1, 2, 3],
    "array2": [
        [
            "key1": "value1",
            "key2": "value2"
        ],
        [
            "key3": "value3",
            "key4": "value4"
        ]
    ]
]

所以,“array1”是一个整数数组,“array2”是一个字典对象数组。我的云函数 没有 除发回收到的内容外,请执行其他操作:

exports.testFunction = functions.https.onRequest((req, res) => {
    return res.status(200).send(req.body)
})

Alamofire 模块:

Alamofire.request(
    "<url>",
    method: .post,
    parameters: data,
    encoding: URLEncoding.httpBody,
    headers: [
        "Authorization": "...",
        "Accept": "application/json"
    ]
).responseJSON { (response) in
    print(response)
}

上面的“打印”语句打印:

这意味着“array1”没有问题,但是cloud函数以某种方式将“array2”作为单个对象的数组接收,该数组有4个键和值对:

"array2": [
    {
        "key1": "value1",
        "key2": "value2",
        "key3": "value3",
        "key4": "value4"
    }
]

为什么会这样?我该如何解决这个问题?