Backport r61458:
Issue 2321: reduce memory usage (increase the memory that is returned
to the system) by using pymalloc for the data of unicode objects.
diff --git a/Misc/NEWS b/Misc/NEWS
index 43bc504..efbfc5f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -11,6 +11,8 @@
 
 Core and builtins
 -----------------
+- Issue #2321: use pymalloc for unicode object string data to reduce
+  memory usage in some circumstances.
 
 Library
 -------