- Removed unused license checker and pump devDependencies.
- Enhanced CI coverage artifacts and updated documentation (grammar fixes, TypeScript typo, README badge).
- Fixed header type providers case, added hint for missing return reply, and corrected ReplyTypeConstrainer array inference.
v4.21.0
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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.