- Patched critical CVE‑2026‑3635 security vulnerability.
- Extensively updated documentation (README, plugins guide, syntax, performance guidance, links, and examples) and clarified content‑type parser/schema mismatch.
- Adjusted example code to use `instance` during plugin registration and refined test cases and CI workflows.
v5.8.3
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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.