Revised the set() and frozenset() implementaion to use its own internal
data structure instead of using dictionaries. Reduces memory consumption
by 1/3 and provides modest speed-ups for most set operations.
diff --git a/Misc/NEWS b/Misc/NEWS
index 1bbec39..1598c64 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,10 @@
Core and builtins
-----------------
+- The implementation of set() and frozenset() was revised to use its
+ own internal data structure. Memory consumption is reduced by 1/3
+ and there are modest speed-ups as well. The API is unchanged.
+
- SF bug #1238681: freed pointer is used in longobject.c:long_pow().
- SF bug #1229429: PyObject_CallMethod failed to decrement some