docs: static boolean hasClashOnLowerTraceId(List<List<Span>> input) {
      int traceCount = input.size();
      if (traceCount <= 1) return false;
  
      // NOTE: It is probably more efficient to do clever sorting and peeking here, but the call site
      // is query side, which is not in the critical path of user code. A set is much easier to grok.
      Set<String> traceIdLows = new LinkedHashSet<>();
      boolean clash = false;
      for (int i = 0; i < traceCount; i++) {
        String traceId = lowerTraceId(input.get(i).get(0).traceId());
        if (!traceIdLows.add(traceId)) {
          clash = true;
          break;
        }
      }
      return clash;
    }