Author here. So I thought when I started the project. But when you think more about it, Rust cannot allocate in an mmapped file, so you're basically on your own

Author here. So I thought when I started the project. But when you think more about it, Rust cannot allocate in an mmapped file, so you're basically on your own, and have to do plain old C-like memory management in the file, except that unlike in C, there is the extra constraint that everything is transactional, pulling the machine's plug needs to "unfree" all freed pages, and "unalloc" all allocated pages.