BUR #39469 has been rejected.
create implication rotated -> third-party_edit
create implication reversed -> third-party_edit
Unlike stitched, images that are sideways or mirrored are still perfectly viewable on a single page. It makes no sense that on one hand we take great care in preventing md5 mismatches to make sure we have the actual, most original image, while on the other hand we allow rotations that at best have a chance to destroy metadata, and at worst cause image degradation through generational loss.
A sort of end-game would be having a flag attached to post so that sideways posts can be displayed correctly on the client side, but that's just quality of life and not necessary to view the images normally.