This would solve the "holding to the head" problem.
Many times, lazy-seq would be used without the need to get the same
cell twice.
In this case, avoiding cashing would both enhance performance and more
importantly would avoid OutOfMemoryError Exceptions like in:

(def r (repeatedly #(rand)))
(last r)

So, something like:
(defn lazy-seq [should_cache? &body] ..
would be beneficial (I think :)

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