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This prevents us from locking forever on any task that doesn't rely on cancellation tokens, in this case, Connection.recv()'s _recv_queue.get() would never complete after the server closed the connection. Additionally, working with cancellation tokens in asyncio is somewhat annoying to do. Last but not least removing the Connection._disconnected future avoids the need to use its state (if an exception was set it should be retrieved) to prevent asyncio from complaining, which it was before.