[racket] Destroy object ?

Hi the list,
I'm a user of Fluxus http://www.pawfal.org/fluxus/
which is a scheme environnement for 3D, audio and games.

I'm trying to learn the racket Oriented Object style and asking myself a
thing?
How the objects can be deleted after their work?
And are they overwrited if an another come to replace one, and the memory
managed well for it?

Thanks in advance.

Best,
Ted
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