Parametric route /:id incorrectly matches / when no static route is registered

[mahendra7041]

I have this setup:

import http from "http";
import FindMyWay from "find-my-way";

const router = FindMyWay({
  defaultRoute: (req, res) => {
    res.statusCode = 404;
    res.end(JSON.stringify({ message: "Not Found" }));
  },
});

router.on("GET", "/:id", (req, res, params) => {
  res.end(JSON.stringify(params));
});

const server = http.createServer((req, res) => {
  router.lookup(req, res);
});

server.listen(3000);

When I hit /, I expect defaultRoute to handle it since there's no / route registered. Instead my /:id handler fires with params.id = undefined.

curl http://localhost:3000
# Expected: 404 from defaultRoute
# Actual:   {} — /:id handler called with id = undefined

The only workaround I found is manually registering a / route, which feels wrong when defaultRoute already exists for this purpose.

• find-my-way version: ^9.5.0
• Node.js version: v24.14.1