Indeed. The problem is that there is no regression suite clearly. Sometimes things get broken and then have to be fixed again. You end up in situation where you

Indeed. The problem is that there is no regression suite clearly. Sometimes things get broken and then have to be fixed again. You end up in situation where you need to tell a person to use a specific version and hope they know how to get it working. This makes communication, which is a really big part of mathematics, extremely difficult.