Should we symlink or redirect between major and minor releases?

Currently we're redirecting from / to /3/ but symlinking from /3/ to /3.7/. I feel like we should redirect instead of symlinking (our builds are not aware of the others, so no canonical links in place).

The benefit of symlinking is that the URLs are stable (/3/ or /dev/). We could perhaps configure nginx to serve from /3.12/ when /3/ is requested, though.