PropsChildren's type isn't exactly Array

I have a component that can pass children nodes which can be empty:

object Hello {
  private val ComponentName = this.getClass.getSimpleName

  private case class Props(message: String)

  private case class Backend(scope: BackendScope[Props, _]) {
    def render(P: Props, C: PropsChildren): vdom.ReactTagOf[Div] = {
      println(C)
      // If C is empty then render an empty div
      if (C.isEmpty) {
        <.div()
      } else {
        <.div(^.cls := "message", 
          C,
          P.message
        )
      }
    }
  }

  private val component = ReactComponentB[Props](ComponentName)
    .stateless
    .renderBackend[Backend]
    .build

  def apply(message: String)(children: ReactNode*): ReactComponentU[_, _, _, TopNode] = {
    component(Props(message), children: _*)
  }
}

My attempt to use is

Hello("message here")() // Is this correct way to pass an empty child?
Hello("message here")(<.div("Children"))

It compiles successfully, but when loading the page on browser, I got the exception for the 1st usage (Hello("message here")()):

I added println(C) inside the Backend.render() method, and I got undefined when calling (Hello("message here")()).

[japgolly]

This will be fixed as part of #259.

[japgolly]

Fixed on topic/neo branch.