coreos/etcd — pull request #537 by xiangli-cmu (2014-02-06 03:36:14+00:00)
Title: fix(watch hidden key) 

If a watcher has given the correct hidden directory, we should allow it to watch the non-hidden events under that hidden directory. This pull request achieves this by checking if the path after the watching prefix has a "/_" which indicates a hidden key.