[IronPython] CP #20099: Stack Overflow using super() in dict subclass

[Jeff Hardy]

Hi,
Django's MultiValueDict is a key piece of its URL routing, and it
appears to be broken on IronPython 2.0RC2 (and RC1) when using a key
of None. See http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=20099
for details.

I hate to be needy with a release so close, but is there any chance of
fixing this for 2.0?

- Jeff