fog/fog — pull request #2612 by sulphur (2014-01-28 15:02:52+00:00)
Title: There is a bug here or maybe i'm using the gem wrong...

you should merge the ACLs after merging the meta_has if not The new permission will be overwritten by the old one.
If Before you had a directory with :
X-Container-Read: .r:*,.rlistings

and you make your directory private again. The new read_acl will be overwritten by the old one in the mata_hash