code: public static boolean
  isRR(int type) {
  	switch (type) {
  		case OPT:
  		case TKEY:
  		case TSIG:
  		case IXFR:
  		case AXFR:
  		case MAILB:
  		case MAILA:
  		case ANY:
  			return false;
  		default:
  			return true;
  	}
  }
docs: Is this type valid for a record (a non-meta type)?