def __setitem__(oid_tid, state_bytes_tid):
    """
        Store the *state_bytes_tid* (``(state_bytes, tid_int)``) for
        the ``(oid, tid)`` pair.

        Note that it does not necessarily mean that the key tid
        matches the value tid.

        Also note that if the object has been deleted, ``state_bytes``
        may be `None`.
        """
