--- Comment #90 from 2011-04-14 03:58:52 PDT ---
(In reply to comment #89)
> (In reply to comment #88)
> In order to support C compatibility, untagged unions must be supported by the
> type system and the GC.

Right, but this doesn't touch much what I have said.
Many programs that use unions contain some mean at runtime to tell what's
inside the union. This information is what onGC() uses.
Where the onGC() union method is not present, or the union contents are
otherwise unknown, the GC may fall back to being not precise and conservative.

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