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Mention that the order-preserving aspect of the new dict

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implementation is an implementation detail (and why that is so).
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Brett Cannon 2016-09-09 11:11:45 -07:00
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Doc/whatsnew/3.6.rst
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@ -416,7 +416,14 @@ Some smaller changes made to the core Python language are:
* :func:`dict` now uses a "compact" representation `pioneered by PyPy
<https://morepypy.blogspot.com/2015/01/faster-more-memory-efficient-and-more.html>`_.
:pep:`468` (Preserving the order of ``**kwargs`` in a function.) is
implemented by this. (Contributed by INADA Naoki in :issue:`27350`. Idea
implemented by this. The order-preserving aspect of this new
implementation is considered an implementation detail and should
not be relied upon (this may change in the future, but it is desired
to have this new dict implementation in the language for a few
releases before changing the language spec to mandate
order-preserving semantics for all current and future Python
implementations).
(Contributed by INADA Naoki in :issue:`27350`. Idea
`originally suggested by Raymond Hettinger
<https://mail.python.org/pipermail/python-dev/2012-December/123028.html>`_.)