Conformance gaps surfaced re-running the library suites:
- defn now keeps a leading docstring as :doc metadata — it was dropped, so
(:doc (meta #'f)) was always nil. Rides the def docstring slot.
- assert (and :pre/:post) throw a real AssertionError instead of an ex-info, so
(catch AssertionError …) / (thrown? AssertionError …) match, with Clojure's
"Assert failed: <msg>\n<form>" message.
- instance? clojure.lang.Seqable was conflated with ISeq, so a vector/map read
as not-Seqable. Split them: Seqable covers every persistent collection, ISeq
only seqs.
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