>> My understanding is
>> that PHP will convert it to an integer before sending it anyways.

No. In my experience an exception thrown
@see: Controller/Response/Abstract.php , Line 230

        if (!is_int($code) || (100 > $code) || (599 < $code)) {
            require_once 'Zend/Controller/Response/Exception.php';
            throw new Zend_Controller_Response_Exception('Invalid HTTP
response code');
        }

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