Unpack Gems equivalent in Rails 3

I usually use rake gems:unpack to gain access to the source of my gems while developing. I find it to be a very easy way to dig into what a gem expects or to see how it works inside. I was trying out Hobo edge on Rails 3, and hit a bug I wanted to fix, but couldn't find an equivalent way to get the source of that gem. StackOverflow kindly offered up bundle package as the equivalent of gems:unpack, but that gets me compiled versions, not the source. I can see how package would be useful for the "real" purpose of unpack -- portable gems for deployment. But that utterly fails for what I'm trying to do here. Any ideas?

Thanks in advance,