There are safe operation extensions like "save add", "save mul" for numbers in Rust which would detect overflows, but you'd have a drawback as it won't return j

There are safe operation extensions like "save add", "save mul" for numbers in Rust which would detect overflows, but you'd have a drawback as it won't return just the number (of type u64, for example), it would return result<u64> and you'd be forced to handle it.