Router matching multiple routes to controllers

I have the following routes defined:

``` javascript
exports.routes = function (map) {
map.all('admin/:controller/:action');
map.all('admin/:controller/:action/:id');
map.all(':controller/:action');
map.all(':controller/:action/:id');
};
```

When I visit /admin/mycontroller/index, I see in my console that compound is trying to access both:

```
Params: {"controller":"mycontroller","action":"index"} // this is correct
Params: {"controller":"admin","action":"mycontroller","id":"index"}
```

But I was expecting only the first to be routed. Is this a bug? Yes, both routes are valid, but only one is supposed to be executed, not every matching route.