Yes, you could trust in the CPU's branch prediction and the optimizer getting smarter in the future, or you could do the thing that's not only more self-documen

Yes, you could trust in the CPU's branch prediction and the optimizer getting smarter in the future, or you could do the thing that's not only more self-documenting (Vec == need to read the code to notice it never grows, array == obviously fixed size) but also guaranteed to work already.