docs: public List<?> getDiscreteDomain(){
  		Field<?> field = getField();
  
  		if(field instanceof HasDiscreteDomain){
  			List<?> validValues = FieldUtil.getValidValues((Field & HasDiscreteDomain)field);
  
  			if(validValues != null && !validValues.isEmpty()){
  				return validValues;
  			}
  		}
  
  		return null;
  	}