Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/MathTrig.php
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();
    }
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();
    }
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