- Added internal tree usage and exposed `prettyPrint` method parameter for improved pretty‑printing (feature)
- Fixed multiple validation and content‑type handling bugs, including undefined schema checks, logger validator errors, and onError hook behavior on aborted handlers (bugfix)
- Updated documentation to add a new collaborator and upgraded several development dependencies (docs)
v4.15.0
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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.