YouTube数据api v3：unsigned long作为unicode字符串返回

Question

根据official documentation，频道资源的响应文档可能包含以下对象：

"statistics": {
    "viewCount": unsigned long,
    "commentCount": unsigned long,
    "subscriberCount": unsigned long,
    "hiddenSubscriberCount": boolean,
    "videoCount": unsigned long
}

我试图调用API但它返回了：

"statistics": {
    "commentCount": "4", 
    "hiddenSubscriberCount": false, 
    "subscriberCount": "300151", 
    "videoCount": "94", 
    "viewCount": "103656"
}

如您所见，unsigned long（int）以string的形式返回。我哪里错了？