docs: function reduce_continued_fraction_step(data){    
    // do 1 divided by fraction
    data = inverse_fraction(data);
    
    // do integer + fraction (which is numerator += integer * denominator)
    //$multiple = Tools_Math::multiply($data['integer'], $data['denominator']);
    //var multiple = data.integer.mul(data.denominator);
    var multiple = data.integer * data.denominator;
  
    //$data['numerator'] = Tools_Math::add($data['numerator'], $multiple);
    //data.numerator = data.numerator.add(multiple);
    data.numerator = data.numerator + multiple;
    
    return data;
  }