- Added onListen hook and support for accessing handler name with route option properties
- Used node: prefix for built‑in modules to bypass require.cache, improving performance
- Improved documentation (link formatting, ecosystem entry, typo fixes) and made minor code/style updates
v4.23.0
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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.