Return the ID of every thread on this board.

        Returns:
            list of ints: List of IDs of every thread on this board.

def get_all_thread_ids(self):
        """Return the ID of every thread on this board.

        Returns:
            list of ints: List of IDs of every thread on this board.
        """
        json = self._get_json(self._url.thread_list())
        return [thread['no'] for page in json for thread in page['threads']]