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After enhancing namedtuple and ConfigParser, I found a simpler approach
that doesn't involve extending the API. The simple way is to use
ordered dictionaries directly. 
With a small tweak to OD's repr, it is fully substitutable for a dict
without changing any client code or doctests (the OD loses its own
eval/repr order-preserving roundtrip but what json already gives now).
See attached patch.