Cocoanetics/DTFoundation — pull request #2 by gmckenzi (2012-02-11 15:52:05+00:00)
Title: Proposed to dispatch_sync the rename, rather than waiting on a rename queue group.

Just a thought.
Wouldn't doing a dispatch_sync on the rename achieve the same behaviour with less code?
Warning: I haven't tried compiling/running this. Just make a quick edit directly in GitHub.