static L<Map> sortedByMapElementDesc(Collection<Map> c, fO key) {
  L<Map> l = new ArrayList(c);
  sort(l, new Comparator<Map>() {
    public int compare(Map a, Map b) {
      ret cmp(b.get(key), a.get(key));
    }
  });
  ret l;
}

static L<Map> mapMethodLike sortedByMapElementDesc(fO key, Collection<Map> c) {
  ret sortedByMapElementDesc(c, key);
}

Began life as a copy of #1010437