In the http://www.nodegit.org/api/tag/, I tried to figure out how to get the tag instance through tag name, but it's really very confusing!

In the Tag.list, it just lists the tag names instead of instances, in the Tag.lookup, I need to pass the oid or Tag ??? If I already get the tag instance why would I need to call the Tag.lookup method? That's really confusing!

Besides, the documentations are not very straight, hope to see relative demos in each api documentation.