static <A> SimpleLiveValue<A> varWithNotifyToLiveValue(Class<A> type, VarWithNotify<A> var) {
  if (var == null) null;
  var lv = new SimpleLiveValue<A>(type);
  var lvRef = weakRef(lv);
  var.onChange(r {
    var lv = lvRef!;
    if (lv == null)
      var.removeChangeListener(this);
    else
      lv.set(var!);
  });
  lv.onChange(-> var.set(lv!));
  ret lv;
}