On Feb 14, 9:13 pm, "Stephen C. Gilardi" <squee...@mac.com> wrote:
> On Feb 14, 2009, at 11:10 PM, Chouser wrote:
>
> > I don't think that's quite right. I don't think it matters in this
> > case, but hash values aren't guaranteed unique. A hash-map can have
> > two keys with the same hash value as long as = returns false. Vectors
> > and lists with the same values evaluate as equal:
>
> > user=> (= '(1 2) [1 2])
> > true
>
> Exactly right. Thanks for the correction.
Well, still not *quite* right, I believe. Last time I checked,
Clojure "hash" matched Java .equals, which is not quite the same thing
as Clojure "=". In particular, a set might contain two "=" numbers
that are not ".equal" to each other:
user> (= 1 (BigInteger. "1"))
true
user> (.equals 1 (BigInteger. "1"))
false
user> (hash-set 1 (BigInteger. "1"))
#{1 1}
-Jason
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