[Python-3000] ordered dict for p3k collections?

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    Mark> I have put a new version (incorporating another implementation
    Mark> idea from Paul Hankin) on PyPI:

    Mark> http://pypi.python.org/pypi/sorteddict

>From that:

    The main benefit of sorteddicts is that you never have to explicitly
    sort.

Surely there must be something more than that.  Wrapping sorted() around a
keys() or values() call is a pretty trivial operation.  I didn't see that
the implementation saved anything.

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