- Fixed documentation links, grammar, and added missing TypeScript types for FastifyInstance methods and the `forceCloseConnections` option.
- Added type definition for `forceCloseConnections` and routed serialization errors to the errorHandler.
- Updated build tooling (dependabot frequency and config, thread locking) and fixed URL‑must‑be‑string validation bug.
v3.27.1
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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.