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>>> true
 
...
>>> "stringification: " + (1==1)
 
"stringification: true"

use v5.10.0;
use boolean;
 
say true;
say "stringification:" . (1==1);

/usr/bin/perl -w /tmp/boolean.pl 
1
stringification:1

use Scalar::Util qw/dualvar/;
 
...
say $false;
say "stringification: " . $false;
say "numification: " . (0+$false);