- Breaking changes: added req.hostname and req.port, removed variadic listen methods and JSON shorthand, and tightened decorator type rules.
- New features: revamped logger API, enhanced content type parsing, early hints support, diagnostics channel events, safe promise types, and per‑content‑type body schemas.
- Extensive docs updates, type definition improvements, deprecation removals, performance tweaks, and numerous bug fixes.
v5.0.0
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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.