Switching commits and rebasing works like I expect it to. You need to update after switching of course. I've always assumed the copy in .git/modules is just a

Switching commits and rebasing works like I expect it to. You need to update after switching of course. I've always assumed the copy in .git/modules is just a cache so I don't have to re-clone the whole submodule if I switch to a commit where the submodule doesn't exist, then switch back.