| A proxy class for a strongly reachable object, similar to the reference
types in java.lang.ref .
This class is simply used for objects that can be GC'ed when the client
is done processing the referent. It's like a SoftReference, which is
clearly marked and can be passed around in unmodifable collections, except
that we want to control when it can be GC'ed.
Ideally this class would be in java/lang/ref and would extend Reference,
if only for symmetry.
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