`CancellableDisposable` does not call `_cts.Dispose()`

[HamzaRino]

We are using UniRx and UniTask. I want to use CancellableDisposable as I usually need to Cancel on Disposal. I started to use UniRx.CancellableDisposable only to find out its implementation does not actually Dispose the inner CancellationTokenSource. And this is the same thing in original implementation System.Reactive.Disposables.CancellableDisposable.

Is this OK? expected? Should I stop using CancellableDisposable and use our own implementation:

private class DisposableCancellation : IDisposable
{
            private CancellationTokenSource _cts;

            public DisposableCancellation(CancellationTokenSource cts)
            {
                _cts = cts;
            }

            void IDisposable.Dispose()
            {
                _cts.Cancel();
                _cts.Dispose();
                _cts = null;
            }
}

[HamzaRino]

closed as answered here.