[Me]
In this case, Armin wants to be able to pass in an ordered dictionary to functions that weren't designed with ordered dicts in mind (config parser, json/yaml parsers, nose, unittest, etc.). Those functions should be able to assume that all the usual dictionary properties are still true. In particular, those functions may make internal comparisons to a regular dict (perhaps as a cached value) and would expect those comparisons to succeed.
One other thought: I was intending to modify namedtuple's _asdict() method to return an OrderedDict but don't want to break any existing code that relies on the returned object having an order insensitive comparison.
A object that currently returns a dict should be able to return an OrderedDict without breaking anything. The proposed change precludes this possibility as well as the ones mentioned above.
Raymond
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