Someone help me understand this. in SCA, StoreItem.Model.js has a function getItemFieldValues that returns ModelsInit.session.getItemFieldValues(fieldset_name, _.pluck(item_ids, 'internalid')).items. But I can't figure out where that's defined. I need to alter the data that's being provided in a fieldset, and I was hoping for a bit of insight into how it's structured.