VecSeq (as produced by {{(seq (vector-of :int 1 2 3))}}) does not implements equals, hashCode, or hasheq and does not play with any other Clojure collections or sequences appropriately in this regard.
user=> (def rs (range 3))
user=> (def vs (seq (vector-of :int 0 1 2)))
user=> rs
(0 1 2)
user=> vs
(0 1 2)
user=> (.equals rs vs)
true
user=> (.equals vs rs) ;; expect: true
false
user=> (.equiv rs vs)
true
user=> (.equiv vs rs)
true
user=> (.hashCode rs)
29824
user=> (.hashCode vs) ;; expect to match (.hashCode rs)
2081327893
user=> (System/identityHashCode vs) ;; show that we're just getting Object hashCode
2081327893
user=> (.hasheq rs)
29824
user=> (.hasheq vs) ;; expect same as (.hasheq rs) but not implemented at all
IllegalArgumentException No matching field found: hasheq for class clojure.core.VecSeq clojure.lang.Reflector.getInstanceField (Reflector.java:271)
Approach: Implement Object.hashCode(), Object.equals(), and IHashEq.hasheq() in the primitive vector seq implementation. All of these leverage the prim vec seq itself rather than the underlying prim vec as it was quite a big simpler. The hasheq() impl calls Murmur3/hashOrdered, which takes an Iterable, so Iterable was also implemented using an iterator over the seq.
Some existing tests were expanded to include coverage of the primitive vec seq.
Patch: clj-1364.patch
