src/Metable.php
public function allowsMeta($key)
    {
        $allowed = $this->getAllowedMeta();

        return empty($allowed) || in_array($key, $allowed);
    }
public function allowsMeta($key)
    {
        $allowed = $this->getAllowedMeta();

        return empty($allowed) || in_array($key, $allowed);
    }
Determine whether meta attribute is allowed for the model.

@param  string $key
@return boolean