Issue #14159: Fix the len() of weak sets to return a better approximation when some objects are dead or dying.
Moreover, the implementation is now O(1) rather than O(n).
Thanks to Yury Selivanov for reporting.
diff --git a/Misc/NEWS b/Misc/NEWS
index 8460cdd..6b3fbc2 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -101,6 +101,10 @@
Library
-------
+- Issue #14159: Fix the len() of weak sets to return a better approximation
+ when some objects are dead or dying. Moreover, the implementation is now
+ O(1) rather than O(n).
+
- Issue #2945: Make the distutils upload command aware of bdist_rpm products.
- Issue #13447: Add a test file to host regression tests for bugs in the