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

[Eric V. Smith]

Eric V. Smith added the comment:

On 09/17/2013 09:34 AM, R. David Murray wrote:
> 
> R. David Murray added the comment:
> 
> Because most often the time at which you want the original key is the point at which you are about to re-serialize the data...so you need the value too.

I can't think of a case where I'd need (original_key, value) where I
wouldn't also be iterating over items(). Especially so if I'm serializing.

On the other hand, I don't have a use case for the original key, anyway.
So I don't have a strong feeling about this, other than it feels odd
that the answer to the original question (I think on python-dev) "how do
we get the original key back?" is answered by "by giving you the
original key and its value".

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