# File lib/active_support/vendor/memcache-client-1.7.4/memcache.rb, line 193
  def decr(key, amount = 1)
    raise MemCacheError, "Update of readonly cache" if @readonly
    with_server(key) do |server, cache_key|
      cache_decr server, cache_key, amount
    end
  rescue TypeError => err
    handle_error nil, err
  end