TODO

   1 BETA 8 TODO
   2 - keys expire
   3 - sunion ssub
   4 - write integers in a special way on disk (and on memory?)
   5 - compact types for disk storing of short strings (no 4 bytes overhead!)
   6 - network layer stresser in test in demo
   7 - maxclients directive
   8 - check 'server.dirty' everywere
   9 - replication tests
  10 - command line client. If the last argument of a bulk command is missing get it from stdin. Example:
  11     $ echo "bar" | redis-client SET foo
  12     $ redis-client SET foo bar
  13     $ redis-client GET foo
  14     bar
  15     $
  16 - Make Redis aware of the memory it is using thanks to getrusage() and report this info with the INFO command.
  17 - INFO command: clients, slave/master, requests/second in the last N seconds, memory usage, uptime, dirty, lastsave
  18
  19 FUTURE
  20
  21 ROLLBACK command:
  22
  23     ROLLBACK UNSET x
  24     SET x 10
  25     EXPIRE x 3600
  26     COMMIT
  27
  28     (multiple rollbacks are allowed)
  29
  30     or alternatively
  31
  32     TRANSACTION SET x 1000
  33     TRANSACTION EXPIRE x 1000
  34     COMMIT
  35
  36     but this sucks since there is no way to check the error message.