CBS_peek_u8
if (!CBS_peek_u8(&cbs, &val))
if (!CBS_peek_u8(cbs, &val))
if (!CBS_peek_u8(cbs, &val))
if (!CBS_peek_u8(cbs, &val))
int CBS_peek_u8(CBS *cbs, uint8_t *out);
if (!CBS_peek_u8(cbs, &version))
int CBS_peek_u8(CBS *cbs, uint8_t *out);