Disposing kernel should dispose IAsyncDisposable singletons inside.

[lsoft]

If StandardKernel is disposing, its singletons are disposing too. I guess it would be correct that IAsyncDisposable singletons will be disposed too.

Or, may be, it is correct to put IAsyncDisposable to the KernelBase too, and perform async-dispose if the kernel is async disposed...

Workaround is not known.