DeepStruct::HashWrapper work not correct.

[zw963]

=> #<DeepStruct::HashWrapper {"default"=>"衣服", "recommended"=>["相机", "自行车", "房屋租赁"]}>
(pry):0> x.recommended
=> #<DeepStruct::ArrayWrapper ["相机", "自行车", "房屋租赁"]>
(pry):0> x.default
=> ni