Cannot omit path as in the example code

[NeatSketch]

In the README there is an example where a router object's add method is called with 1 argument:

users.add(function () {
  // create a new user
})

However, this doesn't work:

Uncaught TypeError: Cannot read property 'replace' of undefined
    at regexify (jouter.min.js:formatted:45)
    at routeRe (jouter.min.js:formatted:49)
    at route (jouter.min.js:formatted:53)
    at Function.add (jouter.min.js:formatted:94)
    at ...

Should this work or is there a mistake in the example code?

---

Also, what is the correct way to handle the following situation?

var rootRouter = jouter.createRouter();
var subRouter = jouter.createRouter();
rootRouter.add(router, '/mypage/...');

subRouter.add(function (x) {
    // Should be called on /mypage/foo/123
    // It works fine
}, '/foo/:x');

subRouter.add(function () {
    // Should be called on /mypage
    // ... but nothing happens
}, '/'); // I also tried '...', '/...', '*' but it doesn't work

I thought that maybe there should be no path specified (as in the example in the README), but the aforementioned error appeared.