public function mergeMetadata( array $savedMetadata, array $providedMetadata ) {
		$keys = [
			'userId',
			'remoteUserName',
			'filteredUserName',
			'canonicalUserName',
			'canonicalUserNameUsed'
		];
		foreach ( $keys as $key ) {
			$savedMetadata[ $key ] = $providedMetadata[ $key ];
		}
		return parent::mergeMetadata( $savedMetadata, $providedMetadata );
	}