Quick Form Validation Questions

[eluser]skunkbad[/eluser]
If a form field is not required, but was left empty, and is processed by form validation, does set_value('that_field') == FALSE ?

Likewise, if the field was posted, but fails validation, does set_value('that_field') == FALSE ?

[eluser]zyzzzz[/eluser]

Code:

function set_value($field = '', $default = '')
{
    if ( ! isset($this->_field_data[$field]))
    {
        return $default;
    }

    return $this->_field_data[$field]['postdata'];
}

[eluser]skunkbad[/eluser]
I guess I should have just looked... thanks.