mojox_run hangs

gistfile1.pl

#!/usr/bin/env perl
use common::sense;

use Data::Dumper;
use MojoX::Run;
use Mojolicious;
say $Mojolicious::VERSION;

my $sub = sub {
	return "hello", "world";
};

my $mojox = MojoX::Run->new;
say "hello";
my $pid = $mojox->spawn_sub(
	$sub,
	exec_timeout => 6,
	exec_cb => sub {
		my ($pid, $res, $except) = @_;

		warn $except if $except;
		warn $res;
		$mojox->ioloop->stop;
	},
);

$mojox->ioloop->start;
say "go go";