[issue18986] Add a case-insensitive case-preserving dict

[Antoine Pitrou]

Antoine Pitrou added the comment:

> > Does it slow down regular dicts?
> 
> I were surprized, but yes. The ComplexPythonFunctionCalls test from
> pybench is 40% slower with ctransformdict.patch (and I still don't
> known why). With dict__transform__.patch it is only 2% slower. All
> other pybench tests are approximately equal.

Did you try any other microbenchmarks? Your approach sounds promising.

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<http://bugs.python.org/issue18986>
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