doc/PLAN


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-- Listener Scenario
create socket, perform bind, set listening
+add read-event listener
+start loop

-- Comm Scenario
provided socket
-inside loop
begin coro
	read - data not ready
	yield sock, needRead
end coro
coro parent == callback
(coro parent
	call coro(sock, event)
	if not ok, go back.. end
	if newEvent ~= event then
		unset event, reset newEvent
	end)