docs: def set_safe(self, is_safe, **kwargs):
          ''' Set this remove to be safe.  It will call getLastError after the
              remove to make sure it was successful.  ``**kwargs`` are parameters to
              MongoDB's getLastError command (as in pymongo's remove).
          '''
          self.safe = is_safe
          self.get_last_args.update(**kwargs)
          return self