- Updated documentation: added reply stream content type info, fixed reference grammar, and added example for decorator dependencies
- Fixed logger typings by restoring setBindings type in FastifyBaseLogger
- Allowed `undefined` as a valid value for a single hook
v4.9.1
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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.