Comment by zahlman

I used it once purely because I figured out that "turn a sequence of per-tile bitmap data into tiles, then produce the image corresponding to those tiles in order" is equivalent to swapping the two inner dimensions of a four-dimensional array. (And, therefore, so is the opposite operation.) The task was extremely non-performance-critical.

Of course I wasn't happy about bringing in a massive dependency just to simplify a few lines of code. Hopefully one day I'll have a slimmer alternative, perhaps one that isn't particularly concerned with optimization.