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use overload
    '0+' => sub { ${$_[0]} },
    '""' => sub { ${$_[0]} ? "true" : "false"},
    '!' => sub { ${$_[0]} ? $false : $true },
    fallback => 1;

use boolean;
$\ = $/;

...
print '$str_true is true but != from true' if $str_true and ($str_true
+ != true);

print "The value of this test is: ", boolean(true||false);

$false is false
$copy is also false
$str_false is true?
But equal to false
$str_true is true but != from true
The value of this test is: true