code: public TaskResponse run(Task k, TaskRequest req) {
          return run(k, req, new RuntimeRequestResponse());
      }
docs: Invokes the specified <code>Task</code> with the specified
  <code>TaskRequest</code>.  Use this overload of the <code>run</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>TaskResponse</code> that results from invoking the
  specified task.