Yet Another CPAN Grep

Number-Natural-SetTheory ( T/TO/TOBYINK/Number-Natural-SetTheory-0.004.tar.gz, TOBYINK, 2014; MetaCPAN )

Number-Natural-SetTheory/lib/Number/Natural/SetTheory.pm ( view source; MetaCPAN )

package Number::Natural::SetTheory;

use 5.010;
use boolean;
use JSON qw/to_json/;
use strict;
use utf8;

our (@EXPORT, @EXPORT_OK, %EXPORT_TAGS);

BEGIN
{
	$Number::Natural::SetTheory::AUTHORITY = 'c

return scalar @$set;
	}
	
	return undef;
}

sub set_to_string
{
	my ($set) = @_;
	my $string = to_json($set);
	$string =~ s/\[/\{/g;
	$string =~ s/\]/\}/g;
	return $string;
}

'What exactly is zero?';