Generational arenas are really nice. I don't know why they are being discovered only now. Like e.g. graphs implemented using generational arenas play nicely with CPU cache.<p>For anyone who cares, here's my Rust crate that's like petgraph but with generational arenas.<p><a href="https://github.com/adamnemecek/pgraph" rel="nofollow">https://github.com/adamnemecek/pgraph</a>