@Nullable
  public static IntUnaryOperator mergeLineConverters(@Nullable IntUnaryOperator convertor1, @Nullable IntUnaryOperator convertor2) {
    if (convertor1 == null && convertor2 == null) return null;
    if (convertor1 == null) return convertor2;
    if (convertor2 == null) return convertor1;
    return value -> {
      int value2 = convertor2.applyAsInt(value);
      return value2 >= 0 ? convertor1.applyAsInt(value2) : value2;
    };
  }
@Nullable
  public static IntUnaryOperator mergeLineConverters(@Nullable IntUnaryOperator convertor1, @Nullable IntUnaryOperator convertor2)