code: public Object evaluate(Task k, TaskRequest req) {
          return evaluate(k, req, new RuntimeRequestResponse());
      }
docs: Invokes the specified <code>Task</code> with the specified
  <code>TaskRequest</code> and returns the <code>RETURN_VALUE</code>.
  Use this overload of the <code>evaluate</code> method if you need to
  pre-load information into the <code>TaskRequest</code>.
  
  @param k A fully-bootstrapped <code>Task</code> object.
  @param req A <code>TaskRequest</code> prepared externally.
  @return The <code>RETURN_VALUE</code> of the specified task.