So recently I actually started to write my own cython version of this library and in doing so I came up with an idea to make it easier to use the socket callbacks. So instead of users needing to use ARES_SOCKET_BAD I made 2 functions that can be used to either process either a read or write file descriptor only. I'll be adding these changes to a future pull request to aiodns since the other reviewers didn't like that I accidently messed around with coverage. (I need to remember to close that pull request and open a new one if these changes get accepted and later updated)

Basically having these should allow users using an event loop to do something like this, this is what I wrote for my version of c-ares and I wanted aiodns to do the same with this library so that ARES_SOCKET_BAD doesn't have to be passed through to the different callbacks.

If you think I should add in sphinx doc strings to this library as well I would be happy to do so.

def _sock_state_cb(self, fd: int, readable: bool, writable: bool) -> None:
        if readable or writable:
            if readable:
                self.loop.add_reader(
                    fd, self._channel.process_read_fd, fd
                )
                self._read_fds.add(fd)
            if writable:
                self.loop.add_writer(
                    fd, self._channel.process_write_fd, fd
                )
                self._write_fds.add(fd)
            if self._timer is None:
                self._start_timer()