code: def get_max_item(self, expand=False):
          
          url = urljoin(self.base_url, 'maxitem.json')
          response = self._get_sync(url)
          if expand:
              return self.get_item(response)
          else:
              return response
docs: The current largest item id
  
          Fetches data from URL:
              https://hacker-news.firebaseio.com/v0/maxitem.json
  
          Args:
              expand (bool): Flag to indicate whether to transform all
                  IDs into objects.
  
          Returns:
              `int` if successful.