code: def raw_send_command(sym, args)
        if @connected
          @connection.send_command(sym, args)
        else
          callback do
            @connection.send_command(sym, args)
          end
        end
        return nil
      end
docs: Send a command to redis without adding a deferrable for it. This is
   useful for commands for which replies work or need to be treated
   differently