- Added new immutable `listeningOrigin` property, async validation support, typed‑array body handling, and allowed lowercase HTTP methods when registering routes.
- Updated documentation (Ecosystem, readme TOC, Vercel Serverless guide, default error handler note, request validation typo) and fixed several type/bug issues such as lowercase methods type, removeHeader type, benchmark script, secondary ...
- Performed CI/workflow and dependency upgrades that do not affect runtime behavior.
v4.18.0
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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.