docs: def qs_set(self, *args, **kwargs):
          '''Set values in QuerySet MultiDict'''
          if args and kwargs:
              raise TypeError('Use positional args or keyword args not both')
          query = self.query.copy()
          if args:
              mdict = MultiDict(args[0])
              for k in mdict.keys():
                  if k in query:
                      del query[k]
              for k, v in mdict.items():
                  query.add(k, v)
          else:
              for k, v in kwargs.items():
                  query[k] = v
          return self._copy(query=query)