public function setBlameGuids($guids = [], $checkValid = true)
    {
        if (!is_array($guids) || $this->multiBlamesAttribute === false) {
            return null;
        }
        if ($checkValid) {
            $guids = $this->unsetInvalidBlames($guids);
        }
        $multiBlamesAttribute = $this->multiBlamesAttribute;
        $this->$multiBlamesAttribute = Number::composite_guid($guids);
        return $guids;
    }