Python’s not a mover but the cycle breaker will walk through every object in the VM. Also since the refcounts are inline, adding a reference to a cold object w

Python’s not a mover but the cycle breaker will walk through every object in the VM. Also since the refcounts are inline, adding a reference to a cold object will update that object. IIRC Swift has the latter issue as well (unless the heap object’s RC was moved to the side table).