Update: the map filter seems to work whether a metadata field contains single values or lists, so that's great. The concern is that the checkbox functionality seems to break, and I'm not sure the checkbox functionality is fully robust yet anyway. But the short answer is that this should work okay with a slight edit to the code that adds classes to the gallery items, and now we just need to figure out how to process the lists from the .csv metadata files (#63). Will push an edit to the multi-select layout soon.
Update: the map filter seems to work whether a metadata field contains single values or lists, so that's great. The concern is that the checkbox functionality seems to break, and I'm not sure the checkbox functionality is fully robust yet anyway. But the short answer is that this should work okay with a slight edit to the code that adds classes to the gallery items, and now we just need to figure out how to process the lists from the .csv metadata files (#63). Will push an edit to the multi-select layout soon.