Add .createFrom() method to instantiate object
Remove JSON parsing

I know. Add, add and then simply remove? The point is that this feature ISN’T required. It’s trivial to parse a JSON stream into a POJO and then pass it along. Can recover this code if needed later.
Move ‘compute’ features into schema from alt repo
Fix location of validate schema on validate
Update cast to work with arrays of scalars
Update .test() to not apply defaults & filters
Validate does NOT filter/default. test->checkValue
Validate can test scalars directly
Minor cleanup + reshuffle code
Clarify error message on cast to<Type>