David, Nicolas, thank you for finding the culprit so quickly :)

What profiling technique/tool did you use?  I have some other code
that is also much slower in 1.3, and thought I'd take a crack at
finding the culprit myself before spamming the list again.

On Sep 24, 11:26 am, Nicolas Oury <nicolas.o...@gmail.com> wrote:
> Try
>
> (defn even?
>   "Returns true if n is even, throws an exception if n is not an integer"
>   {:added "1.0"
>    :static true}
>   [n] (zero? (bit-and (long n) (long 1))))
>
> before your example.
>
> It is fast on my computer.
> (I believe there is a reflective call, without the explicit cast.)

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