- Breaking change: the legacy $GR. reply prefix is removed from gateway handling, preventing its use by clients.
- Extensive bug‑fixes and race‑condition resolutions across JetStream, MQTT, auth callouts, leafnodes and configuration reloads, including TLS certificate pin validation and memory leak fixes.
- Performance and feature upgrades: fast batch publish now reports sequence gaps, memory‑backed streams avoid double copying, remote proxies gain TLS support, and leafnode connections report WebSocket usage.