You can clone with
HTTPS or Subversion.
Seems like this module is related to npm/npm#1543 perhaps? Wanna make it a thing that npm just always can do?
I'm working on it for that exact purpose (I actually started on it after reading npm/npm#3313), my WIP npm branch is called issue-3313 but it's not ready for a merge, yet.
Awesome! Just wanted to make sure :)