Handling modals

For of all, thank you for creating this library and experimenting with it. I really like the stated goals.
I've been dreaming of having easy deep linking in a native app for a long time ;)

Now, I'm trying to see how to handle modal screens (fullscreen or popups).

So far I've tried the following:

``` jsx

```

It works partially:
- when I navigate to `/modal`, I get the correct behavior the first time
- if I go back and navigate again, the modal gets displayed twice quickly
- navigating to `/detail/:themeColor` animates the nav bar incorrectly

Also there's a warning displayed that says `` and `` cannot be nested within ``. So I know this wasn't intended to be done like this ;)

Is there another way to handle this?