William Pitcock added the comment: It seems to me that calling __contains__() (PySequence_Contains()) isn't necessary, as the first and last elements of the list are already known, and therefore known to be in the list. Revising the behaviour of popitem() to avoid calling _odict_popkey_hash() seems like it may provide a marginal performance benefit as well as fix the problem. Calling PyObject_DelItem() directly on the node should work fine I believe.
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