> they force you to be explicit on allocating new memory. Not at all. With e.g. `append` being a “maybe I'll allocate, maybe not, take a guess” kind of method,

> they force you to be explicit on allocating new memory. Not at all. With e.g. `append` being a “maybe I'll allocate, maybe not, take a guess” kind of method, it's basically just like Java's `List.add` with extra steps and much worse egonomics.