title: Will the LRU delete entries that have not been used for some amount of time?
body: <p>When in memcache the available memory is full, memcache uses the LRU (last recently used) algorithm to free memory.
  My question is will the LRU Algorithm rather delete entries that have not been used for some amount of time (last recently used) than expired items? 
  Entries that are expiring are not deleted on that exact moment but when the next time someone tries to access it (AFAIR). So will the LRU Algorithm (also) account for the expiry of keys?</p>