Do you plan to handle accepting a component of a certain type? Like having the

appBar

parameter of

Scaffold

only accept "a component of type appBar"

Is there any point in making this limitation? I mean, you should be able to put anything in your appbar. But for other places, where cruicial, I imagine you can accept an extension function to some restricted context

we can have a named slot that will accept an AppBar by name, but you will always be free to hand in whatever you would like as you may want to write your own App Bar and there is no class inheritance