static int slackReactionScore(S token, S channelID, S timestamp) {
  S url = "https://slack.com/api/reactions.get";
  S postData = "token=" + urlencode(token) + "&channel=" + urlencode(channelID) + "&timestamp=" + urlencode(timestamp);
  S data = doPostWithTimeout(postData, url, slackSetTimeout_get());
  Map map = jsonDecodeMap(data);
  Map msg = cast map.get("message");
  if (msg == null) ret 0;
  //printStructure(msg);
  L<Map> reactions = cast msg.get("reactions");
  if (reactions == null) ret 0;
  //printStructure(reactions);
  int score = 0;
  for (Map r : reactions) {
    S name = cast r.get("name");
    int count = (int) r.get("count");
    if (litlist("confused").contains(name))
      score -= count;
    else 
      score += count;
    /*else 
      print("Unknown reaction emoji: " + name);*/
  }
  ret score;
}