In all big packages I use: yes, it is. This is actually a must given there was no (standard) version management system. If you have no versioning system and don

In all big packages I use: yes, it is. This is actually a must given there was no (standard) version management system. If you have no versioning system and don't make your code backwards compatible, you break someone else's code. So, either you make a new repository, or you make a subpackage in your current repository with the new, breaking version.