It looks like an interesting JS framework. I'm not a huge fan of the big ones which force on you how to structure everything... the apparently minimalist nature of that one feels fairly appealing. Of course need to find the contexts where is works and the ones where it doesn't.

A good summary and reminder on how complicated something as mundane as this can be. From the callee you never quite know what it'll end up being, it's the call site which matters most.