[oconnor663]

I have two different reactions to this:

- From the perspective of e.g. C++, I don't think it's reinventing the heap. We often prefer to use indexes into a std::vector or similar, even when putting everything in std::shared_ptr is an option, because the dense layout of the vector gives us the blazing fast cache performance we crave. It also avoids memory leaks from reference cycles.

- From the perspective of e.g. Python, yeah it's reinventing the heap. Unless you need to serialize the whole collection into JSON or something, it's much less convenient. But (almost) no one uses Rust instead of Python just for the convenience. (There are dozens of us! Dozens!)