> In programming the focus is perhaps better, for something > idempotent, something like: Do it the first time. Don't screw > it up the second time? And don't do the computing if it > doesn't need to be done?
Sorry, but idempotence says nothing at all about computational efficiency or cost. And none of this has anything to do with exif and its behaviour, let alone its manpage. So please stop trolling.
