static <A> A lowestAccordingTo(Collection<A> l, IF1<A, Double> scoreFunction) {
  ret lowestAccordingTo(l, (O) scoreFunction);
}

static <A> A lowestAccordingTo(Collection<A> l, O scoreFunction) {
  new Lowest<A> lowest;
  for (A a : l)
    lowest.put(a, toDouble(callF(scoreFunction, a)));
  ret lowest.get();
}