- Added feature: reply.redirect() and reply.callNotFound() now return the reply object.
- Fixed multiple bugs (request termination crash, port deprecation warnings, schema controller types, generic propagation, flaky tests).
- Updated docs with two v4 breaking changes and exposed exposeHeadRoutes breaking change.
v4.1.0
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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.