- Introduced `hasRoute` API and made the `listen` signature variadic, allowing string ports.
- Replaced deprecated `FastifyLoggerInstance` with `FastifyBaseLogger` in typings and fixed type‑related issues (e.g., nullable `fastify.https`, schema prototype handling).
- Extensive documentation updates: migration guide, ecosystem plugin listings, TypeBox AJV configuration, and Pino pretty printing guidance.
v4.6.0
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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.