From: Chris Quinn <cq@htec.demon.co.uk>

>Would it not be more reasonable to treat the argument and
>finalisation closure as roots until the latter has actually completed
>execution? 

That's exactly what the current system does.  I guess what you want is
that the finalisation function for a value is not called until the
finalisation functions of all values that depend on it have finished
execution.  There are two problems with that:

1. What happens to circular values (a circular value depends on
   itself, directly or indirectly).

2. How to implement it with reasonable efficiency.  I don't have a
   solution.

-- Damien
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