In this particular context, you can think of going from a `&str` to a `&[u8]` via `string.as_bytes()` as a safe cast. The in-memory representation remains the s

In this particular context, you can think of going from a `&str` to a `&[u8]` via `string.as_bytes()` as a safe cast. The in-memory representation remains the same, and the function call will almost certainly be inlined because its implementation is trivial.