code: private Object getRaw(String attributeName) {
          if(frozen){
              throw new FrozenException(this);
          }
  
          if(attributeName == null) {
              throw new IllegalArgumentException("attributeName cannot be null");
          }
          metaModelLocal.checkAttribute(attributeName);
          return attributes.get(attributeName);// TODO: this should account for nulls too!
      }
docs: Gets raw value of the attribute, without conversions applied.