docs: @Deprecated
    public final OkHttpChannelBuilder negotiationType(io.grpc.okhttp.NegotiationType type) {
      Preconditions.checkNotNull(type, "type");
      switch (type) {
        case TLS:
          negotiationType = NegotiationType.TLS;
          break;
        case PLAINTEXT:
          negotiationType = NegotiationType.PLAINTEXT;
          break;
        default:
          throw new AssertionError("Unknown negotiation type: " + type);
      }
      return this;
    }