protected function findValueToSlug($encryptUsing = null)
    {
        if (!$encryptUsing) {
            if (is_array($this->slugEncryptUsing)) {
                foreach ($this->slugEncryptUsing as $field) {
                    $encryptUsing .= $this->slugWorkingRecord->$field;
                }
            } else {
                $encryptUsing = $this->slugWorkingRecord->{$this->slugEncryptUsing};
            }
        }

        return is_numeric($encryptUsing) ? $encryptUsing : implode(array_map(function ($n) {
            return sprintf('%03d', $n);
        }, unpack('C*', $encryptUsing)));
    }