Guess the output...
#!/usr/bin/env perl
use 5.12.0;
use warnings;
use JSON::XS qw(encode_json);
my $port = 1234;
my $j1 = encode_json({ port => $port });
my $foo = "$port";
my $j2 = encode_json({ port => $port });
say $j1;
say $j2;
if ($j1 ne $j2) {
die "WTF Perl?!";
}