Allow mv-list and its attributes on mv-app?

[karger]

In mavo when we have mv-app="foo", foo becomes the name by which we can refer to the root object of the app. Which has always been consistent for apps whose root object is an object. But when the root object is a list it got complicated; you need to define a property inside the mv-app to hold the list and change the way you reference it. But now that we have fixed mv-multiple, the consistent way to have an app whose (root) data is a list would just be to put mv-list onto the mv-app element.

But right now that doesn't work. https://codepen.io/karger/pen/oNmyaqW?editors=1100