- Added statusCode to all validation errors and fixed schema reference resolution using AJV.
- Introduced a union‑aware keyof operator and enforced return types for type providers.
- Updated ecosystem documentation (serverless adapter, SSR Vite, OpenAPI3, cache plugin) and fixed onRoute hook invocation after late registration.
v4.2.0
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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.