Yes, naming does play a role here, but the biggest hint is `as_vec_mut` returning a reference. For that to work a `Vec<u8>` needs to exist somewhere, and contin

Yes, naming does play a role here, but the biggest hint is `as_vec_mut` returning a reference. For that to work a `Vec<u8>` needs to exist somewhere, and continue to exist after this function returns. For comparison, `to_` conversions generally just return the new data, so this reasoning doesn't apply to them.