docs: public static <T extends Tuple> TypeInformation<T> TUPLE(Class<T> tupleSubclass) {
  		final TypeInformation<T> ti = TypeExtractor.createTypeInfo(tupleSubclass);
  		if (ti instanceof TupleTypeInfo) {
  			return ti;
  		}
  		throw new InvalidTypesException("Tuple type expected but was: " + ti);
  	}