the local merge commits are included in the rebase (see
linkgit:git-rebase[1] for details).
+
-When set to preserve, rebase with the `--preserve-merges` option passed
-to `git rebase` so that locally created merge commits will not be flattened.
+When set to `preserve` (deprecated in favor of `merges`), rebase with the
+`--preserve-merges` option passed to `git rebase` so that locally created
+merge commits will not be flattened.
+
When false, merge the current branch into the upstream branch.
+
----
Using --recurse-submodules can only fetch new commits in already checked
out submodules right now. When e.g. upstream added a new submodule in the
-just fetched commits of the superproject the submodule itself can not be
+just fetched commits of the superproject the submodule itself cannot be
fetched, making it impossible to check out that submodule later without
having to do a fetch again. This is expected to be fixed in a future Git
version.