Ability to persist form state as JSON ?

[thiloplanz]

This is more of a question than a feature request, I am not sure if I should be wanting this or if there is a better way, but I find myself needing to store the current state of the form (for example to save it as a "draft" for later retrieval on a server). As soon as the input validates, I can convert it into my Model and have a Json codec for that, but the form may still be invalid (missing or illegal input).

Seeing that both field names and field values are just strings before they get turned into the Model, it seems that there could be a built-in function that can convert the form state into JSON and back again.

Am I completely off track here?