docs: public static void geojsonType(GeoJson value, String type, String name) {
      if (type == null || type.length() == 0 || name == null || name.length() == 0) {
        throw new TurfException("Type and name required");
      }
      if (value == null || !value.type().equals(type)) {
        throw new TurfException("Invalid input to " + name + ": must be a " + type
          + ", given " + (value != null ? value.type() : " null"));
      }
    }