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I cleaned up my patch (attached), but for some reason, it
isn't resolving the refleaks in test_generators. I swear my
patch was resolving them before, but I guess I must've done
something else (maybe in addition to this) that fixed the
leaks. Or maybe I'm just going cross-eyed. I do believe I
implemented GC correctly, and I do believe the leaks are
uncleanable circular references. I haven't had time to debug
it more; if someone else wants to, feel free.