var plyRows = dataset.flatten().map(row => {
            var newRow: any = {};
            for (var k in row) {
              var v = row[k];

              // Kill ranges
              if (v && v.start) v = v.start;

              if (v && v.toISOString) {
                v = dateToSQL(v);
              } else if (Set.isSet(v)) {
                v = v.toString();
              } else if (typeof v === 'boolean') {
                v = Number(v);
              }
              newRow[k] = v;
            }
            return newRow;
          });

 public toSet(): Set {
   if (!this.values) return null;
   return Set.fromJS(this.toArray());
 }