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Perl's built-in logical operators, C<and>, C<or>, C<xor> and C<not>
support 2-value logic. This means that they always produce a result
which is either true or false. In fact perl sometimes returns 0
and sometimes returns undef for false depending on the operator
and the order of the arguments. For "true" Perl generally returns
the first value that evaluated to true which turns out to be
extremely useful in practice. Given the choice Perl's built-in
logical operators are to be preferred -- but when you really want
pure 2-degree logic or 3-degree logic or multi-degree logic they
are available through this module
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