One thing I dont get about maven is why the version number get embedded in the jar's filename. Everything has to be rebuilt when you switch to a new branch that

One thing I dont get about maven is why the version number get embedded in the jar's filename. Everything has to be rebuilt when you switch to a new branch that has a different version number, deployed files cant just be "copied over" etc. Seems a huge impediment to any kind of efficient deploy system. I am not that well versed in build systmes, but I have never seen another build system that does this. Usually version numbers is stored in some meta data not in filenames.