Multidict

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* Don't crash on ``{} - MultiDict().keys()`` and similar operations
:issue:`6`

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* Switch from uppercase approach for case-insensitive string to
:py:meth:`str.title`.
:issue:`5`

* Deprecate ``multidict.upstr()`` class in favor of
:py:class:`~multidict.istr` alias.

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* Don't crash on ``{} - MultiDict().keys()`` and similar operations
:issue:`6`

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* Don't expose ``multidict.__version__``

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* Make ``upstr(upstr('abc'))`` much faster

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* Don't double-iterate during :py:class:`MultiDict <multidict.MultiDict>` initialization
:issue:`3`

* Fixed :py:meth:`CIMultiDict.pop() <multidict.MultiDict.pop>`:
it is case insensitive now.
:issue:`1`

* Provide manylinux wheels as well as Windows ones