perl – 如何创建数据结构的可重复签名？

#!/usr/bin/perl

use Strict;
use warnings;

use Storable ('freeze');

$Storable::canonical = 1;

my $one = { foo => 42,bar => [ 1,2,3 ] };
my $two = { foo => 42,3 ] };

my $one_s = freeze $one;
my $two_s = freeze $two;

print "match\n" if $one_s eq $two_s;

…并证明逆向：

$one = [ 4,5,6 ];
$one_s = freeze $one;

print "no match" if $one_s ne $two_s;