Fix keys, normalize holes (#2452)

* Fix #2434

* Treat holes as unkeyed, normalize boolean/null/undefined

This brings a lot better consistency with that API, even though it's
slightly breaking. (I had to update a bunch of tests to correspond with
it.)

* Fill in PR number [skip ci]

render/hyperscript.js

@@ -93,7 +93,7 @@ function hyperscript(selector) {
 		vnode.children = Vnode.normalizeChildren(vnode.children)
 		if (selector !== "[") return execSelector(selectorCache[selector] || compileSelector(selector), vnode)
 	}
-	
+
 	vnode.tag = selector
 	return vnode
 }