Disposing modem times out because of data in serial port

[AfmanS]

I just started using this library, I converted a .NET Framework 4.8 app I had from that used GsmComm. I'm loving it so far. I did have one problem: after I created a modem, disposing it would hang the task unless I ran serialPort.DiscardInBuffer(); first. I wrote a class around the modem so it would run this everytime, but it feels like something AtLib could handle itself:

public async Task CloseAsync()
{
    if (_serialPort?.IsOpen == true)
    {
        _serialPort.DiscardInBuffer();
    }
    _modem?.Dispose();
}