code: public <T> boolean operator_add(/* @Nullable */ EList<? super T> list, /* @Nullable */ T element) {
  		if(list != null && element != null)
  			return list.add(element);
  		else
  			return false;
  	}
docs: Overrides  the default <code>operator_add()</code> to ignore <code>null</code> elements.