What size if framing opening for 36" door?

Just for fun, I'll add that no one seems to make 34" prehung doors - 36, 32, 30, even some 28's. So if you want an excuse to make your own doors in the face of SWMBO pressure to just buy ugly pre-hungs, just make all your rough openings 36" wide :D:D:D
 
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