Threading is done with the wave character ~ in Racket? I can't decide if I hate it or not (am used to Clojure's ->). I think my pinky finger doesn't like ~.

In this case ~> is a macro from a widely used package (https://docs.racket-lang.org/threading/index.html) so if you defined an alias for it (or forked the package) you could use any valid identifier.

The identifier `->` is already used for type annotations.