Add newsitem for a bugfix backport.

diff --git a/Misc/NEWS b/Misc/NEWS
index 869885da738ab2103ee0f382fe51c4203e8403f8..9ebaebc0d789a2503475365c743165d4b1b45da2 100644 (file)
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -75,6 +75,9 @@ Extension modules
 Library
 -------
 
+- Bug #849662:  UserDict.DictMixin had performance issues when
+  an instance was tested for equality with None.
+
 - Bug #848614: distutils' msvccompiler fails to find the MSVC6
   compiler because of incomplete registry entries.