docs: def _normalize_response_tuple(tuple_):
      """
      Helper function to normalize view return values .
      It always returns (dict, status, headers). Missing values will be None.
      For example in such cases when tuple_ is
        (dict, status), (dict, headers), (dict, status, headers),
        (dict, headers, status)
  
      It assumes what status is int, so this construction will not work:
      (dict, None, headers) - it doesn't make sense because you just use
      (dict, headers) if you want to skip status.
      """
      v = tuple_ + (None,) * (3 - len(tuple_))
      return v if isinstance(v[1], int) else (v[0], v[2], v[1])