it requests fetching everything up to the given tag.
+
The remote ref that matches <src>
-is fetched, and if <dst> is not empty string, the local
+is fetched, and if <dst> is not an empty string, the local
ref that matches it is fast-forwarded using <src>.
If the optional plus `+` is used, the local ref
is updated even if it does not result in a fast-forward