Removed separate serial check operation. All serial operations now use Memcached "add" and "increment" atomic operations, and should be safe for multiple thread environment. Implemented loops with timeouts for serial operations. ns_serial() function now returns serial array containing status together with value. Cache id is now truncated using md5 to prevent reaching Memcached 250char key limit. Because Namespice now relies on Memcached operations, it needs either Memcache API or Cacherouter to work.