Having runnable vs. reusable as independent properties is certainly possible and an interesting idea to consider – that’s what I was alluding to in the last paragraph of this post. However, I’m not convinced that the combinations other than the ones I listed are sensible or practical. For example, I’m quite convinced that providing global runtime configuration makes sense if and only if it makes sense to “run it”. Does it make sense for a package (i.e. reusable code) to also be runnable? It might in the sense of having usage examples.