Here's my first attempt:
(defn all-vals [key coll]
(let [all-vals-w-key (partial all-vals key)]
(cond
(map? coll)
(concat [(key coll)] (all-vals-w-key (vals coll)))
(or (vector? coll) (seq? coll))
(apply concat (map all-vals-w-key coll)))))
Call it like so:
(fact
(all-vals :distance {:goat "al" :distance 35})
=> [35])
(fact
(all-vals :distance [{:goat "al" :distance 35}
{:goat "paula" :distance 25}])
=> [35, 25])
(fact
(all-vals :distance [{:goat "al" :distance 35}
{:goat "paula" :distance 25 :other {:distance 99}}])
=> [35, 25, 99])
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