Fix for http://framework.zend.com/issues/browse/ZF2-571

[delatbabel]

Hopefully this is the correct pull request to fix http://framework.zend.com/issues/browse/ZF2-571

There should only be one commit here, one line change to Form/Element/Checkbox.php

[weierophinney]

Can you please add a test?

[weierophinney]

Closing due to inactivity.

[stillatmylinux]

There is a work around for this. Instead of changing the boolean value in the core file you can just add a InputFilter

namespace MyModule\Form;
use Zend\InputFilter\InputFilter;

class MyFormFilter extends InputFilter {
    public function __construct() {

        $this->add(array(
            'name'       => 'myCheckboxes',
            'required'   => false,
        ));
    }
}