Bug: `serveStatic({ precompressed: true })` returns `text/plain`

[SaekiTominaga]

Environment

• hono@4.7.0 + @hono/node-server@1.13.8
• Windows + Node.js 22.13.1

Steps to reproduce

1. Set precompressed: true for serveStatic()
2. Call c.res as in the following code
3. Prepare the compressed file (e.g. with-compressed.html and with-compressed.html.br)
4. Content-Type is set to text/plain;charset=UTF-8 😥

app.use(
  serveStatic({
    root: "static",
    precompressed: true,
    onFound: (_path, c) => {
      const { res } = c;
    },
  })
);

Minimal Reproducible Example

I have created MRE in the following repository.
https://github.com/SaekiTominaga/mre-hono-static-compress-node

• npm run dev1 → http://localhost:3000/with-compressed.html returns text/html 👍
• npm run dev2 → http://localhost:3000/with-compressed.html returns text/plain 👎
• npm test → "called `c.res` – with compressed" test fails