message: RequestGroup -> 64
  Summary: This is a more reasonable number. There's plenty of room on the stack.
diff: @@ -171,7 +171,7 @@ struct PacketizationRequest {
  Buf packetProtectionKey;
  };
  -using RequestGroup = SmallVec<PacketizationRequest, 16, uint16_t>;
  +using RequestGroup = SmallVec<PacketizationRequest, 64, uint8_t>;
  size_t writePacketsGroup(
  folly::AsyncUDPSocket& sock,
  