A local HTTP server returns {"message":"hello"}. Keep all 20 Miniflare
Responses reachable, yield across 10 explicit GC cycles, then read their bodies.
There are no remote services, credentials, workerd startup, fixed sleeps, or retries.
Tested with Miniflare 5.20261006.1-alpha, Undici 7.29.1, Node.js 24.19.0 and 26.11.0 on macOS 26.6.2 arm64. Bun 1.4.3 is used only to install dependencies; Node runs the reproduction.