>
> (letfn [(fib [x]
>           (memoize
>             #(if (or (zero? %) (= % 1))
>                1
>                (+ (fib (- % 1)) (fib (- % 2))))))]
>   (time (fib 30))
>   (time (fib 30))
>   (time (fib 40))
>   (time (fib 40)))
>

Calling fib just creates a new function, no values
are calculated. So you're measuring the time
it takes to create a function, and not the calculation
of fibonacci numbers.

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