json: more checks when converting object members
json: more checks when converting object members

Not all usecases are supported, clearly identify them in return value

tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot