p4raw-id: //depot/perl@18467
Reflects if taint mode is on or off. 1 for on (the program was run with
B<-T>), 0 for off, -1 when only taint warnings are enabled (i.e. with
-B<-t> or B<-TU>).
+B<-t> or B<-TU>). This variable is read-only.
=item $PERL_VERSION