docs: public DataSet<ST> closeWith(DataSet<ST> solutionSetDelta, DataSet<WT> newWorkset) {
  		return new DeltaIterationResultSet<ST, WT>(initialSolutionSet.getExecutionEnvironment(),
  				initialSolutionSet.getType(), initialWorkset.getType(), this, solutionSetDelta, newWorkset, keys, maxIterations);
  	}