A comparison function, used by LFUMaintenancePolicy, which determines
whether one Item has been used more than a second Item, using said Items'
count properties.
Looks at the last 'n' queries to determine whether the Cache should turn
on optimizations for a mostly-read environment (if the underlying
implementation of ManagedCache supports this).
A comparison function, used by LRUMaintenancePolicy, which determines
whether one Item has been used more recently than a second Item, using said
Items' used properties.