I don't think cyclic references are as rare as the author seems to think. Many problems involve some sort of graph, which might or might not have cycles, and th

I don't think cyclic references are as rare as the author seems to think. Many problems involve some sort of graph, which might or might not have cycles, and the natural representation of such graphs can't just be dismissed as bad design. Weakrefs don't help in that case either. I don't think that invalidates his main argument, but the discussion of cycles seems a bit ill considered.