code: public boolean computeDiff(List<JsonDelta> delta, List<String> context, JsonNode node1, JsonNode node2) {
          boolean ret = false;
          if (context.size() == 0 || filter.includeField(context)) {
              JsonComparator cmp = getComparator(context, node1, node2);
              if (cmp != null) {
                  ret = cmp.compare(delta, context, node1, node2);
              } else {
                  delta.add(new JsonDelta(toString(context), node1, node2));
                  ret = true;
              }
          }
          return ret;
      }
docs: Returns true if there is a difference