• Fixed/mitigated use-after-free issues in the hierarchical timer wheels when Expiry returns None (Issue #565, reported by @sharksforarms).
  • Fixed a bug that caused freed timer nodes to remain in the timer wheels in some edge cases (#566 by @powergee).
  • The mitigation added to v0.12.12 was enhanced by atomically reading the expiration state to prevent rare race conditions that could cause use-after-free issues (#570).
• Fixed Expiry::expire_after_update not clearing expiration time for expired entries (future::Cache: #549, by @singulared, sync::Cache: #564).

Bumped the minimum supported Rust version (MSRV) to 1.71.1, released on August 3, 2023 (#555).

• Fixed use-after-free panic in the hierarchical timer wheels when Expiry returns None (#548, by @awarus).
• Fixed a subtle undefined behavior (UB) in the internal deque::move_to_back method (found by Miri) (#553).

• impl Expiry for some types (#519, by @koushiro).

• Removed several unneeded files from the published package (#541, by @weiznich).
• Removed the once_cell crate from the dependencies (#520, by @Expyron).
• Removed the rustc_version crate from the dev-dependencies (#554).