docs: public List<Object> getAsList(String field, String separator) {
          Object value = get(field);
          if (value == null) {
              return Collections.emptyList();
          } else {
              if (value instanceof List) {
                  return (List) value;
              } else {
                  return Arrays.<Object>asList(value.toString().split(separator));
              }
          }
      }