- Added a public log broadcasting API and extensive cache store enhancements: new :serializer and :compressor options, boolean delete returns, a 7.1 cache format with bare‑string optimization.
- Introduced MessagePack serializers for cache and ActiveSupport messages, improved security by redacting secrets in inspect output and unifying cipher error handling, plus numerous bug fixes (MessagePack thread support, range overlap, hum...
- Deprecated the singleton ActiveSupport::Deprecation API, removed many legacy options, and added a :report deprecation behavior for better production tracking.