git-deps doesn't seem to handle slashes on branch names correctly

At the company where I work, we use some conventions around branch names, including prefixing feature branches with feat/ and bugfix branches with fix/. When I try to feed one of those into either git-deps and git-explode, the following message is printed: Couldn't resolve commitish. I couldn't find any related issue.

Does anyone get the same behavior? I'm using it under Ubuntu 16.04 and Python 3.5.2.

Thanks for the great work! Excited about the possibilities with those new tools and concepts :)