Need a steal/build primer

I've read the docs page (http://javascriptmvc.com/docs.html#!steal.build), but I would like to get a deeper understanding of how the build process works. Is there a more in-depth write up somewhere?

The production file has steal.loading(...) and steal.loaded(...). What do those mean?

Are all the referenced files loaded and compressed? Is jQuery, for example added to production.js and therefore inadvertently loaded a second time? If so, I can control this with the "packaged: false" option. But what is the recommended amount of stuff to include/exclude from production.js?

Also, I totally don't understand the building with shared dependencies stuff. How do you tell it what dependencies are shared?

Thanks for your help!