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Wouldn't this still overflow when one of the values is positive, the other is negative, and their difference is sufficiently large?

The tweet said unsigned ints

Tweet? But yes, sorry, I missed that your post said positive ints. The article was about signed ints, though.

Oh, you are right. For some reason I thought I saw unsigned in there.

C promotion rules can can convert unsigned to signed and vice versa so it still matters.