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+* Protect against concurrent writes to a websocket connection from
+ multiple threads; the underlying OS write is not always threadsafe.
+
+ *Tinco Andringa*
+
+* Add ActiveSupport::Notifications hook to Broadcaster#broadcast
+
+ *Matthew Wear*
+
+* Close hijacked socket when connection is shut down.
+
+ Fixes #25613.
+
+ *Tinco Andringa*
+
Please check [5-0-stable](https://github.com/rails/rails/blob/5-0-stable/actioncable/CHANGELOG.md) for previous changes.