> ...and have some_func know it is being called in an iterator context
> and be able to create it's own iterator. foldr could then be
> done as...

I think may have not only list,scalar,iterator .... context. But some way to
define CONTEXT itself, I don't have idea how ?
array context, boolean context , hash context f.e.

@a == @b   #compare all elements

%x == %c   #compare all key/value pairs of the hash
%c = %b    # copy only those key/value pair that exist in both hashes


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iVAN
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