svoid testWeightlessShuffledIteratorWithSeed() {
  var l = virtualList(26, _i -> charPlus('a', _i));
  S original = join(l);
  for (int seed : countTo(26)) {
    S shuffled = print(join(WeightlessShuffledIteratorWithSeed(l, seed)));
    assertEquals(sortedString(shuffled), original);
  }
}