Fun With Datasets in Harlowe

I'm working with datasets and I have some questions.
First, is there a way to print the contents of a dataset for debugging purposes, or else some other way to decipher what's currently contained in one? Second, if I create a dataset of array variables, how do I add another array to the dataset in a way that means the array itself is an entry in the dataset and not that the contents of the array have been added to a dataset? Thanks!