Module cache 

TTL-based caching with stale-while-revalidate semantics.

This module provides a thread-safe cache with time-to-live (TTL) expiration and the ability to serve stale data during refresh failures.

Structs

SingleValueCache

A single-value cache with TTL, useful for caching expensive one-off computations like bootstrap data.

TtlCache

Thread-safe TTL cache with stale-while-revalidate semantics.