in reply to variable I expect to be tainted isn't: possible explanations?

activeperl :
C:\WINNT\Profiles\CalHenderson\Desktop\lang>perl -T a=123 -b +456 Running... Perl version: 5.006001 Osname: MSWin32 Executable name: C:\Perl\bin\Perl.exe zot is not tainted zot is not tainted 123 is tainted 123 is tainted 1 is not tainted 1 is not tainted [path] is tainted [path] is tainted
C:\WINNT\Profiles\CalHenderson\Desktop\lang>perl -v This is perl, v5.6.1 built for MSWin32-x86-multi-thread (with 1 registered patch, see perl -V for more detail) Copyright 1987-2001, Larry Wall Binary build 628 provided by ActiveState Tool Corp. http://www.ActiveS Built 15:41:05 Jul 4 2001