- Added async trailer support, request.routeOptions object, and typed reply content types via TypeProvider
- Enhanced documentation with spelling/grammar fixes, new sections (capacity planning, list routes, acknowledgements) and corrected examples
- Fixed numerous bugs: type compatibility after pino 8.7, null/undefined fn handling, trailer async race condition, improved hook error messages
v4.10.0
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Fix for two Fastify security advisories (GHSA‑w2qp‑rph6‑63g4 and GHSA‑3m5p‑2c4r‑xxw2).
Added per‑route logging for Google Cloud Functions and introduced `Reply.prototype.mediaType` for easier content‑type handling.
Fixed trailer state clearing when removing all trailers and corrected requestCompleted handling to use null instead of undefined.