docs: def store_async_result(async_id, async_result):
      """Persist the Async's result to the datastore."""
  
      logging.debug("Storing result for %s", async_id)
  
      key = FuriousAsyncMarker(
          id=async_id, result=json.dumps(async_result.to_dict()),
          status=async_result.status).put()
  
      logging.debug("Setting Async result %s using marker: %s.", async_result,
                    key)