Further clojure.core.cache fixes (198 -> 257 of its assertions):
- delay: a throwing body re-ran on every force and never became realized?. Run it
once like Clojure's Delay — cache the exception, mark realized, re-throw the same
on each deref. Fixes value-fn memoization / cache-stampede protection.
- deftype/defrecord: a method name appearing in two protocols with different
arities (data.priority-map's seq is in IPersistentMap [this] AND Sorted
[this asc]) registered per-protocol and shadowed; merge clauses by name across
all protocols into one multi-arity fn.
- empty?/peek/pop (IPersistentStack) dispatch through a deftype's methods; (= a-
deftype other) uses its equiv method (so caches compare to their backing map);
seq handles a host iterator (iterator-seq over .iterator).
- pop of an empty PersistentQueue returns it, like the JVM (was an error).
JVM-certified corpus rows. make test + shakesmoke green.
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