svoid bench_maskDiffing_justTheBitOp_fixedSize() {
  int maskSize = 32;
  L<long[]> images = repF(1000, -> new Image2BAsLongs(randomBinaryImage(maskSize)).pixels);
  long[] mainImage = random(images);
  int maskArraySize = l(mainImage);
  long[] bigArray = concatLongArrays(images);

  print(benchFor5(-> {
    long sum = 0;
    for (int i = 0; i < bigArray.length; i += maskArraySize)
      sum += countDifferingBits_1024bit(mainImage, bigArray, i);
    ret sum;
  }));
}

Began life as a copy of #1036050