Pretty much this. From the post: "Because it produces different results, it would render all our stored checksums invalid, so we'd have to recalculate them all

Pretty much this. From the post: "Because it produces different results, it would render all our stored checksums invalid, so we'd have to recalculate them all. That's a big job, so we'd need to do a lot of testing first to make sure that it's so much better that it's actually worth the effort."