docs: def ingress_filter(self, response):
          """ Flatten a response with meta and data keys into an object. """
          data = self.data_getter(response)
          if isinstance(data, dict):
              data = m_data.DictResponse(data)
          elif isinstance(data, list):
              data = m_data.ListResponse(data)
          else:
              return data
          data.meta = self.meta_getter(response)
          return data