I wish real projects were so simple! Guidelines like this are operating on something like the Platonic ideal shape of problems. In any real world project, you

I wish real projects were so simple! Guidelines like this are operating on something like the Platonic ideal shape of problems. In any real world project, you need to consider the cost of handing a malformed `data` blob downstream, as it's never free. Architectural model or pattern might be a better word than guideline. You benefit by collecting a catalog of patterns more than you do by trying to internalize guidelines.