I do this because I also want to implement this using another way , like
```
{
  page: 1,
  users: present users, with: UserEntity, only_return_not_set_body: true
}
```
but  this introduce a new reserved option key to tell the present method only return the representation , not set the body instance variable ,it may  break compatibility if someone already using the key. so I stopped. Any suggestion?