Author: Armin Rigo <ar...@tunes.org>
Branch:
Changeset: r88825:668cdca5a890
Date: 2016-12-02 17:14 +0100
http://bitbucket.org/pypy/pypy/changeset/668cdca5a890/
Log: Document the fix of set literal orders
diff --git a/pypy/doc/whatsnew-head.rst b/pypy/doc/whatsnew-head.rst
--- a/pypy/doc/whatsnew-head.rst
+++ b/pypy/doc/whatsnew-head.rst
@@ -5,6 +5,15 @@
.. this is a revision shortly after release-pypy2.7-v5.6
.. startrev: 7e9787939641
+
+Since a while now, PyPy preserves the order of dictionaries and sets.
+However, the set literal syntax ``{x, y, z}`` would by mistake build a
+set with the opposite order: ``set([z, y, x])``. This has been fixed.
+Note that CPython is inconsistent too: in 2.7.12, ``{5, 5.0}`` would be
+``set([5.0])``, but in 2.7.trunk it is ``set([5])``. PyPy's behavior
+changed in exactly the same way because of this fix.
+
+
.. branch: rpython-error-to-systemerror
Any uncaught RPython exception (from a PyPy bug) is turned into an
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