(let [s (-> #{}
transient
(conj! (clojure.core/with-meta [-7] {:mynum 0}))
(conj! (clojure.core/with-meta [-7] {:mynum -1}))
persistent!)]
[(meta (s [-7])) (meta (first s))])
=> [{:mynum -1} {:mynum 0}]
basically it looks like the "key" (the value we get by seqing on the set) retains the metadata from the first conj! but the "value" (what we get by calling invoke with the "key") carries the metadata from the second conj!. This does *not* match the behavior if we don't use transients:
(let [s (-> #{}
(conj (clojure.core/with-meta [-7] {:mynum 0}))
(conj (clojure.core/with-meta [-7] {:mynum -1})))]
[(meta (s [-7])) (meta (first s))])
=> [{:mynum 0} {:mynum 0}]
(found playing with zach tellman's collection-check)
