Message370

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Oops, You're right. 

We probably should use a mixed
approach using both finalizers and a registration
mechanism.
If we use weak refs we should use:
System.gc()
System.runFinalization()

[Although from my experiments it seems that gc implies
runFinalization, but the doc does not confirm this]

in order to be sure that we do not have
cleared weak refs was referent finalizer will
not be called because we will just exit then soon.