docs: public static NumberList deltaInverse(Map<String, Object> map) {
          LinkedHashMap<String, Long> values = new LinkedHashMap<String, Long>(map.size());
          for (Entry<String, Object> k : map.entrySet()) {
              Object v = k.getValue();
              Number current = getNumber(v);
              long d = -current.longValue();
              values.put(k.getKey(), d);
          }
  
          return new NumberList(values);
      }