val toIndex = minOf(source.buffer.size, maxByteCount) + 1L
      val boundaryIndex =
        source.indexOf(
          bytes = crlfDashDashBoundary,
          fromIndex = 0L,
          toIndex = toIndex,
        )
      return when {
        boundaryIndex != -1L -> boundaryIndex // We found the boundary.

  }

  @Override
  public E get(int index) {
    return delegateList().get(index);
  }

  @Override
  public ImmutableList<E> subList(int fromIndex, int toIndex) {
    return unsafeDelegateList(delegateList().subList(fromIndex, toIndex));
  }

  @Override
  public Object[] toArray() {
    // Note that ArrayList.toArray() doesn't work here because it returns E[]
    // instead of Object[].

    assertThat(input).isEqualTo(expectedOutput);
  }

  private static void testSortDescending(
      byte[] input, int fromIndex, int toIndex, byte[] expectedOutput) {
    input = Arrays.copyOf(input, input.length);
    SignedBytes.sortDescending(input, fromIndex, toIndex);
    assertThat(input).isEqualTo(expectedOutput);
  }

  public void testSortDescendingIndexed() {