Issue #20367: Fix behavior of concurrent.futures.as_completed() for duplicate
arguments.  Patch by Glenn Langford.
diff --git a/Misc/ACKS b/Misc/ACKS
index ba32f6b..a8bb161 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -703,6 +703,7 @@
 Torsten Landschoff
 Ɓukasz Langa
 Tino Lange
+Glenn Langford
 Andrew Langmead
 Detlef Lannert
 Soren Larsen