code: function has_interesting_tags(t, ignore_tags) {
        if (typeof ignore_tags !== "object")
          ignore_tags={};
        if (typeof options.uninterestingTags === "function")
          return !options.uninterestingTags(t, ignore_tags);
        for (var k in t)
          if (!(options.uninterestingTags[k]===true) &&
              !(ignore_tags[k]===true || ignore_tags[k]===t[k]))
            return true;
        return false;
      }
docs: helper function that checks if there are any tags other than "created_by", "source", etc. or any tag provided in ignore_tags