binding对 json 传递为null的struct字段做了struct内各字段的tag检查

[lixiangchen-zh]

type Address struct{
        City  string       `form:"city,required" json:"city,required" query:"city,required"`
} 

type User struct{
        Name      string      `form:"name" json:"name,required" query:"name"`
        Address  *Address   `form:"address" json:"address,omitempty" query:"address"`
}

// request body 为json {"name":"Jack", "address":null}
var user model.User
err = binding.BindAndValidate(c, &user)

预期user能正常的绑定，user.Address == nil，实际上返回错误提示 binding: expr_path=address.city, cause=missing required parameter