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#!/usr/bin/perl
use strict;
use warnings;
...
} else {
    print "$var7 ($var7 - as an unquoted number) False\n"; 
}

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$var (0) False
$var (undef) False
$var1 ('')  False
...
$var5 (1 in single quotes) True
$var6 (1 in double quotes) True
$var7 (1 - as an unquoted number) True