This is an excellent pattern. Nix uses it to allow one to create a full transitive build graph, serialized that plan, move it around, and execute it in a distri

This is an excellent pattern. Nix uses it to allow one to create a full transitive build graph, serialized that plan, move it around, and execute it in a distributed and reproducible fashion. There are always temptations to loosen the constraints this imposes, but they nearly always come at a cost of undermining the value of the pattern.