public function enabled($feature)
    {
        $feature_value = $this->value($feature);

        if (is_null($feature_value)) {
            return false;
        }

        // If value is one of the positive words configured then the
        // feature is enabled.
        if (in_array(strtoupper($feature_value), config('laraplans.positive_words'))) {
            return true;
        }

        return false;
    }