Also notable that Nim's new(ish) ORC collector combines reference counting to free memory relatively eagerly (just like python has) with an implementation of th

Also notable that Nim's new(ish) ORC collector combines reference counting to free memory relatively eagerly (just like python has) with an implementation of the Recycler algorithm to collect cycles (python handles this with occasional mark+sweep which is effective but not nearly as efficient as Recycler ... or, frankly, nearly as cool ;).