当JSON字段出现子字段重名时toJSON异常---4.0.0-beta.1

例如,当某个JSON字段类似这种结构["father": ["name": "Li"], "mother": ["name": "Wang"]]

struct Child: HandyJSON {
var father: String = ""
var mother: String = ""
mutating func mapping(mapper: HelpingMapper) {
mapper <<< father <-- "father.name"
mapper <<< mother <-- "mother.name"
}
}
let childJSON = ["father": ["name": "Li"], "mother": ["name": "Wang"]]
let child = Child.deserialize(from: childJSON)
print(child ?? "失败")
print(child?.toJSON() ?? "失败")
deserialize可以成功,但是toJSON结果异常:
Child(father: "Li", mother: "Wang")
["name": "Wang"]

Start by reproducing the issue with the supplied Child struct, nested father and mother name fields, and HelpingMapper mappings. Compare deserialize and toJSON results; done means both mapped child fields serialize without one nested name overwriting the other.

Written by the indexing model from the issue text.