use constant TRUE       => 1;
use constant FALSE      => 0;
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Declaring such constants in Perl is generally agreed to be a Bad Idea. The return value of many "true" values in Perl will generally not be equal to your "TRUE". And the return values of some "false" values is undef, which will only noisily be equal to your "FALSE" (when warnings are enabled).

Just use the truth and falsehood tests within Perl as designed. Don't invent a data type or constant that doesn't exist.

-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.

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