fix: propagate duplex transform sink errors #8
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Sink errors were either getting smothered or causing unhandled promise rejections depending on your platform.
This breaks on Chrome when creating an abortable-iterator from a duplex transform stream that you then try to abort.
Instead if the sink of a duplex stream being used as a transform returns a promise, propagate errors thrown by the sink into it's source so they can be caught and handled by the consumer.