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Normally, we would have a deprecation period before switching the return type. Potentially, this patch could break existing code that relied on methods like move_to_end() which are present in OrderedDict() but not in dict().

That said, I think such code is either unlikely or rare, so it would be net less disruptive for users to just go forward with this patch.

Since this would be a break from our usual policies, you would need to get the support of other core-devs before this patch could be applied.

Let's not do this -- see the python-dev thread. It's no big deal anyways.

Thanks rhettinger and gvanrossum, I am going to close this PR.