docs: def _render_serializable(self, list_of_objs, context):
          """Iterates through the passed in `list_of_objs` and calls the
          `_render_serializable` method of each object's Resource type.
  
          This will probably support heterogeneous types at some point (hence
          the `item_types` initialization, as opposed to just item_type), but
          that might be better suited to something else like a ResourceDict.
  
          This method returns a JSON-serializable list of JSON-serializable
          dicts.
          """
          output = []
          for obj in list_of_objs:
              if obj is not None:
                  item = self._item_resource._render_serializable(obj, context)
                  output.append(item)
          return output