The return type is not an Option, so what else can you do? The only other thing is to use a checked operation explicitly so that it remains in the release configuration, but it isn't the default choice.

This code compiles for the pre-set test but does not consider the worst case. It is not a good practice not to consider the worst case. For example: If you enter an i32::Max or an i32::Min as a parameter, this code will panic. Reporting this code as "Best Practice" is not a good sign of knowing how to look deeply into the problem that has been posed.