static <A> S levenClosestIC(Map<S, A> map, S s) {
  ret levenClosestIC(keys(map));
}

static <A> S levenClosestIC(Collection<S> l, S s) {
  int limit = Integer.MAX_VALUE-1;
  new Lowest<S> best;
  for (S key : unnull(l)) {
    limit = leven_limitedIC(s, key, limit);
    best.put(key, limit);
  }
  ret best!;
}