Pipelining of requests to improve throughput
-- new parameter max-pipelined-requests (default 20) for maximum number of requests to batch at one time
Deletion of counter keys when zero
-- new parameter delete-when-zero (default false) to enable. This will cause a redis eval to execute to decrement counters instead of DECR.
Detection of negative limit counters
-- Self healing of negative counters (due to key eviction, etc)
