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81cc6829f4
Fixed bug in asyncio implementation where the greenlet adaptation system failed to propagate ``BaseException`` subclasses, most notably including ``asyncio.CancelledError``, to the exception handling logic used by the engine to invalidate and clean up the connection, thus preventing connections from being correctly disposed when a task was cancelled. Fixes: #6652 Change-Id: Id3809e6c9e7bced46a7a3b5a0d1906c4168dc4fc