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Most programming languages have a native Boolean data type. Perl
does not.
Perl has a simple and well known Truth System. The following scalar
values are false:
$false1 = undef;
$false2 = 0;
$false3 = 0.0;
$false4 = '';
$false5 = '0';
Every other scalar value is true.
This module provides basic Boolean support, by defining two special
objects: true and false.
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