--- a/mercurial/localrepo.py Wed Jan 27 15:06:02 2021 +0100
+++ b/mercurial/localrepo.py Thu Jan 28 15:12:48 2021 +0100
@@ -3639,11 +3639,11 @@
# effectively locks out old clients and prevents them from
# mucking with a repo in an unknown format.
#
- # The revlog header has version 2, which won't be recognized by
+ # The revlog header has version 65535, which won't be recognized by
# such old clients.
hgvfs.append(
b'00changelog.i',
- b'\0\0\0\2 dummy changelog to prevent using the old repo '
+ b'\0\0\xFF\xFF dummy changelog to prevent using the old repo '
b'layout',
)