This simple method gives the low API a super powerful and simple way to mutate the value of any node, which is then reflected in the root node, can than be serialized again and, voila! now our spec is editable.
Model for v2 and v3 has been validated, now to build out a simple high level creation API, as well as port in 3.1 models (I think there are two). and this is ready for heavier testing.