It's a funy and original trick but on this example at least,
it seems slower (and it can use a lot of memory, because it retains a
stack in the heap) than trampoline:
(time (get-value (even 15000000)))
"Elapsed time: 1899.881769 msecs"
And a version with trampoline
(defn odd [^long x]
(if (zero? x)
false
#(even (dec x))))
(defn even [^long x]
(if (zero? x)
true
#(odd (dec x))))
(time (trampoline (even 15000000)))
"Elapsed time: 366.496137 msecs"
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