Implement PEP 412: Key-sharing dictionaries (closes #13903)
Patch from Mark Shannon.
diff --git a/Misc/NEWS b/Misc/NEWS
index 5bb9b92..6b9fbed 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,10 @@
Core and Builtins
-----------------
+- Issue #13903: Implement PEP 412. Individual dictionary instances can now share
+ their keys with other dictionaries. Classes take advantage of this to share
+ their instance dictionary keys for improved memory and performance.
+
- Issue #14630: Fix a memory access bug for instances of a subclass of int
with value 0.