Does it definitely do that? You could easily avoid it by making the "resize" really a move if you don't actually need more space.
I feel like they're over-selling it anyway by comparing to `std::deque` (which is not hard to beat). The only advantage this has over a standard ring buffer (like Rust's VecDeque) is that the data is completely contiguous, but you'll pay a small performance cost for that (regular memmove's when used as a queue), and I'm not sure how useful it is anyway.
I feel like they're over-selling it anyway by comparing to `std::deque` (which is not hard to beat). The only advantage this has over a standard ring buffer (like Rust's VecDeque) is that the data is completely contiguous, but you'll pay a small performance cost for that (regular memmove's when used as a queue), and I'm not sure how useful it is anyway.