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It should be "allowed", but not by default in normal arithmetic. This has cost Etherum developers and their victims a lot of money e.g.: https://github.com/ethereum/solidity/issues/796

Ideally you'd be able to specify which mechanism you wanted for arithmetic as a property of a type, so you could have int_saturating and int_wraparound and int_nooverflow in the same code with the compiler preventing you from combining them by mistake.

C made it undefined because at the time of its manufacture twos-complement had not quite comprehensively won. There were still a few ones-complement systems in the 80s. https://en.wikipedia.org/wiki/UNIVAC_1100/2200_series




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