def quiet
      old = Thread.current[::Dalli::QUIET]
      Thread.current[::Dalli::QUIET] = true
      yield
    ensure
      @ring&.pipeline_consume_and_ignore_responses
      Thread.current[::Dalli::QUIET] = old
    end
#
Turn on quiet aka noreply support for a number of
memcached operations.

All relevant operations within this block will be effectively
pipelined as Dalli will use 'quiet' versions.  The invoked methods
will all return nil, rather than their usual response.  Method
latency will be substantially lower, as the caller will not be
blocking on responses.

Currently supports storage (set, add, replace, append, prepend),
arithmetic (incr, decr), flush and delete operations.  Use of
unsupported operations inside a block will raise an error.

Any error replies will be discarded at the end of the block, and
Dalli client methods invoked inside the block will not
have return values