protected function saveFeature(RolloutableInterface $feature)
    {
        $this->storage->set($this->getKey($feature->getName()), (string)$feature);
        $features = $this->getFeatures();
        if (false === in_array($feature->getName(), $features)) {
            $features[] = $feature->getName();
        }
        $this->storage->set($this->getFeaturesKey(), implode(',', $features));
    }