docs: protected UriTemplate nest(CharSequence uriTemplate, Object... parserArguments) {
          if (uriTemplate == null) {
              return this;
          }
          int len = uriTemplate.length();
          if (len == 0) {
              return this;
          }
  
          List<PathSegment> newSegments = buildNestedSegments(uriTemplate, len, parserArguments);
          return newUriTemplate(uriTemplate, newSegments);
      }