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As a matter of principle, garbage collection in Python should *always* work, for all types, except for the one documented exception (cycles involving __del__). Failure of a type to properly garbage collect should be considered as serious as an interpreter crash; I hence propose this issue as release blocker.
In addition, failure to support tp_traverse means that gc.get_referents doesn't work for the type, which is an inconvenience even in regular (non-cyclic) usage.