This is why I never fully embraced to the REPL-driven development style espoused by CL users. Even if I am using hot reloading during my development workflow, I

This is why I never fully embraced to the REPL-driven development style espoused by CL users. Even if I am using hot reloading during my development workflow, I never keep a long-running development image and I never expect to distribute or run that image as the finished product. I always build a fresh clean image/executable (eg via ASDF) and run a separate test suite. Interestingly this problem has arisen more recently in the Jupyter notebook ecosystem, and is being rediscovered by a generation of non-programmer data analysts / scientists and the programmers that need to support them. Some interesting solutions like "reactive" notebooks have arisen out of that. It would be very interesting to have something like that for Common Lisp. Maybe Mathematica already has it.