--- a/mercurial/shelve.py	Mon Jan 11 09:26:48 2021 -0800
+++ b/mercurial/shelve.py	Fri Jan 08 23:08:37 2021 -0800
@@ -625,7 +625,7 @@
     info = []
     seen = set()
     for (filename, _type) in names:
-        name, ext = filename.rsplit(b'.', 1)
+        name = filename.rsplit(b'.', 1)[0]
         if name in seen:
             continue
         seen.add(name)