> > I ask because my sum
> > types can be big (I'm dealing with trees), so it would be good if when I
> > want to check if two trees are the same, all I need to do is look at the
> > references to them.
> 
> Use == if you want to compare addresses.

How much do you need to worry about, ex., the GC moving stuff around and
messing this up?

 - Hal


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