src/Metable.php
protected function saveMeta()
    {
        foreach ($this->getMetaAttributes() as $attribute) {
            if (is_null($attribute->getValue())) {
                $attribute->delete();
            } else {
                $this->metaAttributes()->save($attribute);
            }
        }
    }
protected function saveMeta()
    {
        foreach ($this->getMetaAttributes() as $attribute) {
            if (is_null($attribute->getValue())) {
                $attribute->delete();
            } else {
                $this->metaAttributes()->save($attribute);
            }
        }
    }
Save new or updated meta attributes and delete the ones that were unset.

@return void