static public A roundTrip <A, F>(A a, Writer <A, F> w, Reader <A, F> r)
{
var ms = new System.IO.MemoryStream();
var sink = Sinks.ToOutputStream(ms);
w.Bind(sink).Invoke(a);
sink.Finished();
// NOTE: don't remove this. its super useful.
//Console.Write("bytes: " + ms.ToArray().Select((x) => x.ToString()).Aggregate((x,y) => x + ", " + y) + "\n");
var o = r.Bind(Sources.FromByteArray(ms.ToArray())).Get;
return(o);
}
