}
    assertThat(rangesIndices).isEqualTo(rangesIndices.sorted())

    // Check the ranges.
    for (r in 0 until rangesOffsets.size) {
      val rangePos = rangesOffsets[r] * 4
      val rangeLimit =
        when {
          r + 1 < rangesOffsets.size -> rangesOffsets[r + 1] * 4
          else -> rangesOffsets.size * 4
        }

      // Confirm this range starts with byte 0.