> That's true for signed numbers too though? `int_min - 2 > int_min`

No, that's undefined behavior in C, and if you care about correctness, you run at least your testsuite in CI with -ftrapv so it turns into an abort().

Which makes them even less safe than unsigned, where it is defined, yes? The optimizations that can lead to are incredibly hard to predict.

Besides, for safety there are much clearer options, like wrapping_add / saturating_add. Aborting is great as a safety tool though, agreed - it'd be nice if more code used it.