What you're describing works great if the server is running at head. I'd like the server to be able to execute a code path which mimics my Git branch, and on t

What you're describing works great if the server is running at head. I'd like the server to be able to execute a code path which mimics my Git branch, and on the next request to execute a code path which mimics your Git branch. If you and I have two different versions of f(), I'd like them both to be available to be executed, based on some flag or condition. As we merge our branches, f() will collapse back into the CI/CD pipeline you imagine, yes.