void main(final List<String> args) async {
  final largefileSize = pow(10, 8).toInt();

  final value = Uint8List(largefileSize);
  final stream = Stream.value(value.map((final e) => e).toList());

  final stopwatch = Stopwatch()..start();

  /// 2960ms
  final data = await stream.expand((final element) => element).toList();
  final result = Uint8List.fromList(data);

  /// 1250ms
  final result = Uint8List.fromList([
    for (final element in await stream.toList()) ...[
      ...element,
    ],
  ]);

  /// 859ms
  final result = Uint8List.fromList([
    for (final element in await stream.toList()) ...element,
  ]);

  /// 180 ms
  final buffer = BytesBuilder();
  for (final element in await stream.toList()) {
    buffer.add(element);
  }
  final result = buffer.toBytes();

  stopwatch.stop();
  print(stopwatch.elapsedMilliseconds);
}