Set the cache expiration policy for aged entries.
Items in the cache older than when seconds may be flushed at any time. Items are expired in a lazy manner, so it is
indeterminate when the items will physically be removed.
Note you can set both an age and an access limit. The age acts as a hard limit on cache entries.
| this | |
| when |
Timeout for age expiry, or -1 to disable. |