In some situations, especially if we are using extremely low-level programming, sometimes used for high-performance computing, we will need to perform some pointer arithmetics or even Single Instruction, Multiple Data (SIMD) intrinsics that will require unsafe scopes. This might be the case in some specific functions or pieces of code, but in general, we should avoid unsafe scopes.
A rule of thumb is this: if you are not working on performance-critical code, do not use them. If you are, use them very carefully and only in places where there is no other option to improve performance. This means that usually intrinsic code can be wrapped in one module or function.
To make sure nobody uses unsafe code outside the scope ...
