📜🤖 Added by blurb_it.

blurb-it[bot] · web-flow · commit 1db31220effc · 2026-03-05T14:13:11.000Z
diff --git a/Misc/NEWS.d/next/Library/2026-03-05-14-13-10.gh-issue-145546.3tnlxx.rst b/Misc/NEWS.d/next/Library/2026-03-05-14-13-10.gh-issue-145546.3tnlxx.rst
@@ -0,0 +1,4 @@
+Fix :func:`unittest.util.sorted_list_difference` to deduplicate remaining
+elements when one input list is exhausted before the other. Previously,
+duplicates in the tail were included in the output despite the documented
+guarantee that "Duplicate elements in either input list are ignored."
