It would be more flexible to be able to specify optional :git/path next to :git/url and :sha.
This would resolve deps.edn to a subfolder of checked-out git repo. For people who want to keep multiple deps.edn projects in a single repo or want to move deps.edn deeper into directory structure but still be able to use :git/url.
I looked at the source briefly and it looks like a simple change. I would prepare a patch if you agreed with the concept.