Yes - the base image is compiled to a shared library. There is a mechanism for including package/user code in the system image if you compile Julia yourself. I

Yes - the base image is compiled to a shared library. There is a mechanism for including package/user code in the system image if you compile Julia yourself. It works well with a wide range of packages, but the goal is to generalize this and make it usable with binary releases, and probably to compile packages to separate shared libraries.