anchor.diff:  }
   
   final GZipCodec _gzip = new GZipCodec();
  +
  +/// Returns a valid `gs://` URI for a given [bucket] + [path] combination.
  +String _bucketUri(Bucket bucket, String path) =>
  +    "gs://${bucket.bucketName}/$path";
  
positive.code:       try {
          await bucket.delete(name);
        } catch (e, st) {
          _logger.warning('Snapshot delete failed: $name', e, st);
        }
      }
    }
  
negative.code: 
    Future fetch() async {
      Future<Map> load(String path) async {
        _logger.info('Loading popularity data: ${_bucketUri(bucket, path)}');
        try {
          Stream<List<int>> stream = bucket.read(path);
          if (path.endsWith('.gz')) {
  