[IronPython] Default-valued arguments to C# functions

[Jeff Hardy]

On Fri, Apr 23, 2010 at 7:01 PM, Dino Viehland <dinov at microsoft.com> wrote:
> I think removing optional should give you the correct behavior - if that
> Works then yes it is the expected behavior :).

No, removing Optional makes the parameter required.

>
> I guess we're checking for Optional before DefaultValue and for Optional we
> are matching the reflection behavior of passing Missing.Value.  It also gives
> you a way to disambiguate whether the user passed None/null or if they
> didn't provide the parameter.

Maybe check if DefaultValue is provided? It's definitely surprising
that adding DefaultValue(null) doesn't set it to null.

- Jeff