code: public static function INT($number)
      {
          $number = Functions::flattenSingleValue($number);
  
          if ($number === null) {
              return 0;
          } elseif (is_bool($number)) {
              return (int) $number;
          }
          if (is_numeric($number)) {
              return (int) floor($number);
          }
  
          return Functions::VALUE();
      }
docs: INT.
  
  Casts a floating point value to an integer
  
  Excel Function:
  INT(number)
  
  @category Mathematical and Trigonometric Functions
  
  @param float $number Number to cast to an integer
  
  @return int Integer value