pythonGH-100425: Note improved commutativity in sum(). (pythonGH-107785)

(cherry picked from commit aab6f71) Co-authored-by: Raymond Hettinger <[email protected]>
miss-islington · Aug 8, 2023 · adb32cd · adb32cd
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diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
@@ -1752,7 +1752,7 @@ are always available.  They are listed here in alphabetical order.
       The *start* parameter can be specified as a keyword argument.
 
    .. versionchanged:: 3.12 Summation of floats switched to an algorithm
-      that gives higher accuracy on most builds.
+      that gives higher accuracy and better commutativity on most builds.
 
 
 .. class:: super()

diff --git a/Doc/whatsnew/3.12.rst b/Doc/whatsnew/3.12.rst
@@ -505,8 +505,8 @@ Other Language Changes
 * :class:`slice` objects are now hashable, allowing them to be used as dict keys and
   set items. (Contributed by Will Bradshaw, Furkan Onder, and Raymond Hettinger in :gh:`101264`.)
 
-* :func:`sum` now uses Neumaier summation to improve accuracy when summing
-  floats or mixed ints and floats.
+* :func:`sum` now uses Neumaier summation to improve accuracy and commutativity
+  when summing floats or mixed ints and floats.
   (Contributed by Raymond Hettinger in :gh:`100425`.)
 
 * Exceptions raised in a typeobject's ``__set_name__`` method are no longer