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+Repair inter-actor stream closure semantics to work correctly with
+``tractor.trionics.BroadcastReceiver`` task fan out usage.
+
+A set of previously unknown bugs discovered in `257
+<https://github.com/goodboy/tractor/pull/257>`_ let graceful stream
+closure result in hanging consumer tasks that use the broadcast APIs.
+This adds better internal closure state tracking to the broadcast
+receiver and message stream APIs and in particular ensures that when an
+underlying stream/receive-channel (a broadcast receiver is receiving
+from) is closed, all consumer tasks waiting on that underlying channel
+are woken so they can receive the ``trio.EndOfChannel`` signal and
+promptly terminate.