successor = Arrays.copyOf(requireSuccessors(), newCapacity);
  }

  @Override
  int firstEntryIndex() {
    return firstEntry;
  }

  @Override
  int adjustAfterRemove(int indexBeforeRemove, int indexRemoved) {
    return (indexBeforeRemove >= size()) ? indexRemoved : indexBeforeRemove;
  }

  @Override
  public @Nullable Object[] toArray() {