cookie v9 + cors v9 = Fastify 4.x multipart v8 = Fastify 4.x (downgrade from v9 which targets 5.x) static v7 = Fastify 4.x (downgrade from v8 which targets 5.x) fastify reverted to 4.x Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
All @fastify/* plugins (cookie, cors, multipart, static) were already on 5.x-targeted versions; fastify itself was still on 4.29.1. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>