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Attached are two test cases for this patch.
test_simple_producer still fails with the new patch because it should be:
 self.producer_fifo.extendleft([first, data])
instead of:
 self.producer_fifo.appendleft([data, first])
The order of the items in the list is reversed, as documented in
deque.extendleft. So the attachment also includes the corrected patch
with this single change.
I still think that if num_sent == 0, then 'first' should be put back
in the queue. This means that initiate_send should not attempt anymore
to send an empty string, which is confusing anyway, and therefore at
the beginning of initiate_send, when 'if not first', then we should
return in all cases and not only when 'first' is None.