It turns out RVM installs Ruby 2.0 fast on Ubuntu 13.04 because it gets ruby binaries from:
https://rvm.io/binaries/ubuntu/13.04/x86_64/(found via rvm --debug install 2.0.0)
Is there any documentation about these binaries? Example: How they are built, who builds them, if they can be used in other projects? etc. etc. etc.
I checked the binaries and they hold no docs about themselves.