Scott Robertson

The new `filter_fields` argument in pymongo changes from `None` to `{}`, as with `query_filter`. https://github.com/uriyyo/fastapi-pagination/blob/91cdd7a706705d8c5d0dbe51d690fb3db06c4803/fastapi_pagination/ext/pymongo.py#L31 However, in pymongo `None` means "perform no filtering" and `{}` means "return only the ObjectId"....