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Backwards incompatible change:
Added new return value *aiter_exc* to :func:`~async_stagger.staggered_race`.
It contains the exception raised by the async iterator, if any.
Added new argument *detailed_exceptions* to
:func:`~async_stagger.create_connected_sock`.
When set to True, when the connection fails, a
:class:`~async_stagger.exceptions.HappyEyeballsConnectError` is raised,
containing all the exceptions raised by the connect / resolution tasks.
Added debug logging features.