>From: Markus Mottl <markus@mail4.ai.univie.ac.at>

>would return "la" unchanged but "lb" would now share the common structure
>with list_a (= la) (also when inserted in any other order).

Look for "hash-consing" in the (LISP) literature.  But doing it for
arbitrary types looks complex.


>  * Support automatic GC? Or should the user make sure that possible
>    administrative memory overhead is prevented by telling "'a t" that
>    some value need not be remembered for sharing with further values
>    anymore.  The "automatic" version is probably less efficient and
>    much more complicated.

Module Weak is here to help you solve this problem.

-- Damien
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