> Also, is there a simple way to implement a function (perhaps using
> Obj.magic) which will walk a (possibly circular) network of tuples,
> arrays, variadic entities and lists, and return the total number of
> bytes used up by that structure? I see that this should be possible
> in principle with the present implementation of the runtime if one
> could get some basic information about the internal type of an
> array.

Jean-Christophe Filliâtre's "size" library does exactly this:

       http://www.lri.fr/~filliatr/software.en.html

- Xavier Leroy