The type of the cached value
OptionalaccessNumber of cache hits for this item (for LRU)
OptionalaccessMonotonic sequence number (for LRU tie-breaking)
Timestamp when created (for staleness calculation)
Timestamp when expires (for TTL)
OptionallastLast access timestamp (for LRU)
OptionalstaleTimestamp when becomes stale for SWR (optional)
The cached value (or WeakRef if useWeakRef enabled)
Cache item structure with metadata for TTL, LRU, and staleness tracking.