- Fixed plugin tracking (hasPlugin) and prevented double responses when requests are destroyed.
- Applied bodyLimit checks after full body decoding and corrected TypeProvider usage in errorHandler.
- Enhanced TypeScript typings: FastifyRequest.id now a string and added onRoute to ApplicationHookLookup.
v4.22.0
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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.