- Add configurable error‑handler override feature
- Fix type definitions, prevent freezing of request.routeOptions, and address flaky async hook issues
- Update documentation (remove sentry plugin, add community disclaimer, improve emojis) and reorganize test suite
v5.4.0
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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.