<?php
namespace Respect\Validation\Rules;

class Digit extends AbstractCtypeRule
{
    public $additionalChars = "\n\r\t ";
    protected function ctypeFunction($input)
    {
        return ctype_digit($input);
    }
}


<?php
namespace Respect\Validation\Rules;

class Digit extends AbstractCtypeRule
{
    protected function ctypeFunction($input)
    {
        return ctype_digit($input);
    }
}


Remove redundant and filter is inherited
Remove redundant  and filter is inherited
