QWZ_NODE_FLAG_HAVE_PAIRWISE_KEY
nq->flags &= ~(QWZ_NODE_FLAG_HAVE_PAIRWISE_KEY |
const int want_keymask = (QWZ_NODE_FLAG_HAVE_PAIRWISE_KEY |
nq->flags |= QWZ_NODE_FLAG_HAVE_PAIRWISE_KEY;
nq->flags &= ~QWZ_NODE_FLAG_HAVE_PAIRWISE_KEY;