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I added an implementation of the reader as an asyncio protocol (https://docs.python.org/3/library/asyncio-protocol.html). This should provide a more reliable way of reading the serial port using asyncio then the previous implementation. As it is more in the spirit of asyncio. It does away with the queue and endless loop.
I have not implemented all new protocols variants yet, will do that soon. Let me know what you think of it.