Bug: CodeIgniter\Files\File::getSize() - wrong type of result

[WinterSilence]

Describe the bug
CodeIgniter\Files\File::getSize() return int|string (+ error in doc @return integer|null), but this method extends SplFileInfo::getSize() and must return integer.

CodeIgniter 4 version
develop

Fix

/**
 * Size units ('b' - byte, 'kb' - kilobytes, 'mb' - megabytes).
 * 
 * @var array
 */
public const SIZE_UNITS = [
    'b' => 1,
    'kb' => 1024,
    'mb' => ‭1048576‬,
];

/**
 * The file size in bytes or null if unknown.
 *
 * @var int|null
 */
protected $size;

/**
/**
 * Retrieve the file size in bytes.
 *
 * Implementations SHOULD return the value stored in the "size" key of
 * the file in the $_FILES array if available, as PHP calculates this based
 * on the actual size transmitted.
 * 
 * @return int
 */
public function getSize(): int
{
    if ($this->size === null)
    {
        $this->size = parent::getSize() ?: @filesize($this->getPathname());
    }
    return (int) $this->size;
}

/**
 * Retrieve the file size by
 *
 * @param string $unit The unit to return.
 *
 * @return float|null
 */
public function getSizeByUnit(string $unit = 'b'): ?float
{
    if (! $this->getSize())
    {
        return null;
    }
    $unit = strtolower($unit);
    if (! isset(static::SIZE_UNITS[$unit]))
    {
        throw new InvalidArgumentException('Wrong unit');
    }
    return round($this->getSize() / static::SIZE_UNITS[$unit], 3);
}

[lonnieezell]

Care to submit this as a PR?