static BufferedImage mergeBufferedImagesVertically(BufferedImage... images) {
  ret mergeBufferedImagesVertically(asList(images));
}

static BufferedImage mergeBufferedImagesVertically(Cl<BufferedImage> images, O... _) {
  if (l(images) == 1) ret first(images);
  ret mergeImagesVertically(map toRGBImage(images), _).getBufferedImage();
}