I had some trouble understanding this at first too.
"Here I want to dispatch on the class of the first argument xs. "
on the first aargument, ie xs, or on the first argument of xs?
This should work:
(defmulti group
(fn [xs n]
(class xs)))
(defmulti group
(fn [xs n]
(class (first xs))))
(defmethod group dispatch-type [xs n] ...)
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