// f: A -> Comparable
static <A> L<A> sortedByCalculatedField(Iterable<A> c, O f) {
  ret sortByCalculatedField(c, f);
}

static <A> L<A> mapLike sortedByCalculatedField(O f, Iterable<A> c) {
  ret sortedByCalculatedField(c, f);
}

static <A, B> L<A> sortedByCalculatedField(Iterable<A> c, IF1<A, B> f) {
  ret sortedByCalculatedField(c, (O) f);
}