> I LOATHE the fact that you traverse lists and vectors in completely different ways

In Racket:

    (for ([x xs]) (displayln x))

This works for `xs` being a sequence, which includes lists and vectors.

Making the type explicit generates faster code:

    (for ([x (in-list   xs)]) (displayln x))
    (for ([x (in-vector xs)]) (displayln x))