I see no mention of intersection types in the [documentation](https://docs.racket-lang.org/ts-guide/types.html), is [this one the only reference?](https://docs.racket-lang.org/ts-reference/type-ref.html#%28form._%28%28lib._typed-racket%2Fbase-env%2Fbase-types..rkt%29._~e2~88~a9%29%29) I would love to learn about them?