- Refactored source file names to kebab‑case and moved options processing to a dedicated function.
- Improved error handling: custom error handlers now accept unknown types, async validator errors are consistent, HEAD routes handle web‑stream payloads, and IPv6 hostnames are parsed correctly.
- Enhanced documentation (stream error handling, async plugins, fastify/sse core plugin, devtools) and CI workflow refinements.
v5.6.2
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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.