svoid bench_maskDiffing_justTheBitOp() {
  int maskSize = 32;
  L<long[]> images = repF(1000, -> new Image2BAsLongs(randomBinaryImage(maskSize)).pixels);
  long[] mainImage = random(images);
  print(benchFor5(-> {
    long sum = 0;
    for (image : images)
      sum += countDifferingBits(image, mainImage);
    ret sum;
  }));
}

Began life as a copy of #1036046