//When I run this method, it is used in Task.WhenAny() with more such instances (I'm trying to tap into streams in proxy to log what's flowing).
//This method throws IndexOutOfRangeException on readable[i].CopyToAsync(outputStreams[i]) - Debugger shows value of 'i' in time of execution is 2 (outputStreams.Length is 2).
//Shouldn't lambda exception store the value of 'i' from time of declaration, instead of finding the current value (which might not exist already)?

public static Task MultiplyStream(this Stream inputStream, params Stream[] outputStreams)
{
  var splitStream = new ReadableSplitStream(inputStream);
  Stream[] readable = new Stream[outputStreams.Length];
  Task[] tasks = new Task[outputStreams.Length];
  for (int i = 0; i < outputStreams.Length; i++)
  {
    readable[i] = splitStream.GetForwardReadOnlyStream();
    tasks[i] = Task.Run(() => readable[i].CopyToAsync(outputStreams[i]));
  }

  splitStream.StartReadAHead();

  return Task.WhenAll(tasks);
}