Cannot update dom when initial state is undefined or null

[cubxx]

const s = van.state();
van.add(document.body, van.tags.div(() => s.val));
s.val = 'new';

The initial s.val is undefined, so vanjs won't create a DOM to bind with the state.
Maybe creating an empty TextNode is a solution.

[Tao-VanJS]

This is intended behavior. Because in the binding function for a child DOM node, returning undefined or null means you want to delete that node. See the Removing a DOM node section in VanJS tutorial.