I find it beautiful that HashSet<T> in Rust is a thin wrapper around HashMap<T, ()>. I'm glad it's a wrapper, though. I wouldn't like it if everyone had to writ

I find it beautiful that HashSet<T> in Rust is a thin wrapper around HashMap<T, ()>. I'm glad it's a wrapper, though. I wouldn't like it if everyone had to write `HashMap<u16, ()>` and so on and know which methods still made sense.