passing parameter bug?

[eluser]sukuiter[/eluser]
Hi, I just testing code igniter today. I found something weird.

In controller I got a value from variable then I pass it to the view.

Code:

if ($this->form_validation->run() == FALSE)
{
   echo "controller:".$this->input->post('level_up');
   $this->pass['level'] = $this->input->post('level_up');
   $this->load->view('form', $this->pass);
}

In the view I simply just echo the variable.

Code:

<?php echo "view:" . $level;?>

It's working for normal values, but what's not working is 0(zero). 00 is working.
The zero is printed in controller but not in view.

Is this a bug?
I'm using code igniter 2.0