Typed-arena is a bit limited, because all the allocated values must be of the same type. bumpalo[0] removes that restriction, but it also doesn't run destructors, which can lead to memory and other resource leaks. Another worry I have with bumpalo is that I don't think it's been reviewed thoroughly for unsoundness.

Still, bumpalo has been used to great effect in dodrio[1], a React-like library for Rust with really good performance.

[0]: https://crates.io/crates/bumpalo

[1]: https://github.com/fitzgen/dodrio