issue_comments: 236727385

A simple way is to try creating a Data Array by assuming it's metadata, and if it fails then assume it's data. However, this will probably "work" too often on lists it shouldn't. A better heuristic is that if the list is of length 2 or 3, and the first element is an iterable of strings, and the second element contains data (is a list or numpy array), and the optional third element is a map/dictionary, then the list is probably metadata. You might also require that the second element isn't the same length as the first element, in the case that they're both lists (in case someone wants a 2x2 DataArray of string labels that they're constructing from a list of lists).