为啥toJSON方法转字典后，并不是自己创建的属性名

var wId : String? = ""

override func mapping(mapper: HelpingMapper) {
mapper <<<
self.wId <-- "id"
}

toJSON之后获取的key是“id”而不是wId，这么玩的吗

Start with the mapping snippet in the issue and trace how toJSON chooses the output key after mapper << self.wId <-- "id". Compare the mapped key with the Swift property name and check existing serialization tests or examples. Done means the intended key behavior is established and covered by a reproducible test.

Written by the indexing model from the issue text.