code: def _op_msg_uncompressed(flags, command, identifier, docs, check_keys, opts):
      
      data, total_size, max_bson_size = _op_msg_no_header(
          flags, command, identifier, docs, check_keys, opts)
      request_id, op_message = __pack_message(2013, data)
      return request_id, op_message, total_size, max_bson_size
docs: Internal compressed OP_MSG message helper.