static <B, C, A extends Map<B, C>> L<A> lambdaMapLike sortByTransformedMapKey_alphaNum(IF1<C, S> transform, Iterable<A> c, B key) {
  L<A> l = cloneList(c);
  sort(l, (a, b) ->
    cmpAlphaNum(transform.get(mapGet(a, key)), transform.get(mapGet(b, key))));
  ret l;
}