Issue #20637: Key-sharing now also works for instance dictionaries of subclasses.  Patch by Peter Ingebretson.
diff --git a/Misc/ACKS b/Misc/ACKS
index 12b5ab5..14a8cb8 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -585,6 +585,7 @@
 Lars Immisch
 Bobby Impollonia
 Meador Inge
+Peter Ingebretson
 Tony Ingraldi
 John Interrante
 Bob Ippolito