IssueTracker

Meaning that each key-value there would be removed after X time of not being accessed.

This can be useful for cases that the cache might hold large objects that we don't want to hold for too much time, but still wish to offer it in case they were created recently.

Each time you put a new item, you could set a timeout for how long it will stay (0 or negative in case you want it to avoid setting a timeout).
Each time you get a reference to the item via the cache, it will reset the timeout for this item.