final Map<String, Object> valueCount = new HashMap<>(2, 1f);
                            valueCount.put("value", e.getKey());
                            valueCount.put("count", e.getValue());
                            return valueCount;
                        }).collect(Collectors.toList()));
                        return fieldMap;

      Object key = requireNonNull(stream.readObject());
      int valueCount = stream.readInt();
      if (valueCount <= 0) {
        throw new InvalidObjectException("Invalid value count " + valueCount);
      }

      ImmutableList.Builder<Object> valuesBuilder = ImmutableList.builder();
      for (int j = 0; j < valueCount; j++) {
        valuesBuilder.add(requireNonNull(stream.readObject()));
      }

      Object key = requireNonNull(stream.readObject());
      int valueCount = stream.readInt();
      if (valueCount <= 0) {
        throw new InvalidObjectException("Invalid value count " + valueCount);
      }

      ImmutableSet.Builder<Object> valuesBuilder = valuesBuilder(valueComparator);
      for (int j = 0; j < valueCount; j++) {
        valuesBuilder.add(requireNonNull(stream.readObject()));
      }

      Object key = requireNonNull(stream.readObject());
      int valueCount = stream.readInt();
      if (valueCount <= 0) {
        throw new InvalidObjectException("Invalid value count " + valueCount);
      }

      ImmutableSet.Builder<Object> valuesBuilder = valuesBuilder(valueComparator);
      for (int j = 0; j < valueCount; j++) {
        valuesBuilder.add(requireNonNull(stream.readObject()));
      }