Feature request: evict items when limits are reached.

[beckend]

To not crash the app by eating all memory.
Optional ability to limit by total size or number of keys. Probably LRU eviction, even allow user to provide callback.

[al8n]

Optional ability to limit by total size or number of keys

Yeah, this a reasonable feature.

Probably LRU eviction, even allow user to provide callback.

There is a compact method to allow users to remove old version entries. The crate is not a cache but an in-memory MVCC database.