Transformer that marks every attribute as sensitive unless it has been explicitly set as non-sensitive (not quite my usecase but close). I've found where Entity.build receives that info as opts, and I can get and replace the attribute with the Transformer helpers, but I'm not seeing any way to determine if it was explicitly set in the Transformer. Is there a built-in way to determine what has been explicitly set? If not, any ideas for easily grabbing that info?