static <A> L<A> sortedDescAccordingTo(Collection<A> c, final O scoreF) {
  L<A> l = cloneList(c);
  sort(l, new Comparator<A>() {
    public int compare(A a, A b) {
      ret stdcompare(toDouble(callF(scoreF, b)), toDouble(callF(scoreF, a)));
    }
  });
  ret l;
}