message: Make DSR scheduler set an F14
  Summary: As in title. No reason for it to be sorted.
diff: @@ -18,7 +18,7 @@ uint64_t writePacketizationRequest(
  TimePoint writeLoopBeginTime) {
  DSRStreamFrameScheduler scheduler(connection);
  uint64_t packetCounter = 0;
  - std::set<DSRPacketizationRequestSender*> senders;
  + folly::F14FastSet<DSRPacketizationRequestSender*> senders;
  SCOPE_EXIT {
  std::for_each(
  senders.begin(), senders.end(), [](auto* sender) { sender->flush(); });
  