AsyncCommand must be cast to IAsyncCommand or ICommand to access CanExecute and CanExecuteChanged

[cmeeren]

While unit testing a command defined as AsyncCommand instead of IAsyncCommand (as you mentioned in #11), I discovered that I could not access MyAsyncCommand.CanExecute or .CanExecuteChanged; I had to cast it everywhere I wanted to access these properties:

((IAsyncCommand) MyAsyncCommand).CanExecute.

Just checking to see if this is a deliberate choice on your part, and if so, what the reasons are.

[StephenCleary]

This is deliberate. The CanExecute and CanExecuteChanged members are intended for use by UI bindings, and not code directly.