message: Use 0-len client cids by default
  Summary: ^
diff: @@ -50,7 +50,7 @@ class QuicClientTransport
  folly::EventBase* evb,
  std::unique_ptr<folly::AsyncUDPSocket> sock,
  std::shared_ptr<ClientHandshakeFactory> handshakeFactory,
  - size_t connectionIdSize = kDefaultConnectionIdSize) {
  + size_t connectionIdSize = 0) {
  auto client = std::make_shared<TransportType>(
  evb, std::move(sock), std::move(handshakeFactory), connectionIdSize);
  client->setSelfOwning();
  