public function setDelimiter($delimiter)
    {
        if (empty($delimiter) === false && Format::isString256($delimiter) === true) {
            $this->delimiter = $delimiter;
        } else {
            $msg = "The 'delimiter' argument must be a non-empty string, '" . gettype($delimiter) . "' given.";
            throw new InvalidArgumentException($msg);
        }
    }