FWIW, a version of ancestors that exhibits proper (IMO) behaviour:
(defn ancestors
([tag] (ancestors global-hierarchy tag))
([h tag] (not-empty
(let [ta (get (:ancestors h) tag)]
(if (class? tag)
(let [superclasses (set (supers tag))]
(apply clojure.set/union
ta
superclasses
(map #(get (:ancestors h) %) superclasses)))
ta)))))
- Chas
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