Request for comments:

The OpenMapTiles schema states

If there is no more general class for the subclass this field will contain the same value as subclass

To give an example: amenity=parking is currently rendered as class=amenity and subclass=parking. As I understand the schema, it should be class=parking and subclass=parking

The key amenity is assigned as class value here:

POI Tags like amenity, historic, leisure, tourism, waterway should not be a class. However, the following tags are classes in the OpenMapTiles schema:

-- list of OSM keys that can be used for POI classification
poiTagsAsClass  = { aerialway = "aerialway",
					office = "office",
					railway = "railway",
					shop = "shop"}
}

They should be used as class but the other keys should not, therefore at the end of the line k is changed to v (which is then also the value of the subclass). Suggestion:

			class = poiClasses[v] or poiTagsAsClass[k] or v