> I am from perf point of view. Hardly. So:
* With lent: `[]` does not do the deref but the caller does as the address is irrelevant. * Without lent: `[]` does do the deref in order to hand you an `int` and the caller does not have to deref. So in both cases there is an address computation and a memory fetch. No compiler optimization of `lent int` to `int` required. (But yes, it is possible.)
