Multipart params bug or not

gistfile1.pl

use Mojolicious::Lite;

post '/' => sub {
	my $self = shift;
	
	my @test = $self->req->param('test');
	return $self->render_text(join "\n", @test);
};

use Test::Mojo;
use Test::More tests => 9;

my $t = Test::Mojo->new;

$t->post_form_ok('/', , {
	test => [1..5],
})
  ->status_is(200)
  ->content_is(join "\n", 1..5)
;


# error

$t->post_form_ok('/', , {
	test => [1..5],
	metafile => { file => $0 },
})
  ->status_is(200)
  ->content_is(join "\n", 1..5)
;

# ok, why?

$t->post_form_ok('/', , {
	test => [1..5],
	metafile => { file => $0 },
})
  ->status_is(200)
  ->content_is(join ",", 1..5)
;