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+Fix ``Portal.run_in_actor()`` returns ``None`` result.
+
+``None`` was being used as the cached result flag and obviously breaks
+on a ``None`` returned from the remote target task. This would cause an
+infinite hang if user code ever called ``Portal.result()`` *before* the
+nursery exit. The simple fix is to use the ``Channel.uid`` as the
+initial "no-result-received-yet" flag.