'option depth' <depth>::
Deepens the history of a shallow repository.
+'option deepen-since <timestamp>::
+ Deepens the history of a shallow repository based on time.
+
+'option deepen-not <ref>::
+ Deepens the history of a shallow repository excluding ref.
+ Multiple options add up.
+
'option followtags' {'true'|'false'}::
If enabled the helper should automatically fetch annotated
tag objects if the object the tag points at was transferred