public void ToReactivePropertySlimAsSynchronizedObservableCase()
{
var source = new ReactivePropertySlim <int>(100);
var target = source.ToReactivePropertySlimAsSynchronized(x => x.Value,
ox => ox.Select(x => x.ToString()),
ox => ox.Where(x => int.TryParse(x, out _)).Select(x => int.Parse(x)));
target.Value.Is("100");
target.Value = "10";
source.Value.Is(10);
target.Value = "xxx";
source.Value.Is(10);
}