diff -r 9b5fbe5ead89 -r 4a3abb33380a mercurial/manifest.py
--- a/mercurial/manifest.py	Mon Jan 21 22:46:31 2019 +0100
+++ b/mercurial/manifest.py	Fri Apr 26 00:48:12 2019 +0200
@@ -1419,7 +1419,7 @@
 
 # and upper bound of what we expect from compression
 # (real live value seems to be "3")
-MAXCOMPRESSION = 10
+MAXCOMPRESSION = 3
 
 @interfaceutil.implementer(repository.imanifeststorage)
 class manifestrevlog(object):