Function nodes mess up order

[fennifith]

Got this to occur in a random situation a while ago:

div(
    p("Hello"),
    () => button("Sign In").className("button")
).attr("style", "text-align: center;");

Renders as:

<div style="text-align: center;">
  <button class="button">Sign In</button>
  <p>Hello</p>
</div>

[fennifith]

I'm pretty sure this is because of how it handles promises; resolveChildren in particular uses an await Promise.all(...) that might be causing this issue before it even gets to the render function.