objectFormat = newhash
compatObjectFormat = sha1
-Specifying a repository format extension ensures that versions of Git
-not aware of NewHash do not try to operate on these repositories,
-instead producing an error message:
+The combination of setting `core.repositoryFormatVersion=1` and
+populating `extensions.*` ensures that all versions of Git later than
+`v0.99.9l` will die instead of trying to operate on the NewHash
+repository, instead producing an error message.
+ # Between v0.99.9l and v2.7.0
+ $ git status
+ fatal: Expected git repo version <= 0, found 1
+ # After v2.7.0
$ git status
fatal: unknown repository extensions found:
objectformat