Wrong return type for imagejpeg GD function

[MauricioFauth]

The return type of the imagejpeg function is bool not false|string.

 imagejpeg(GdImage $image, resource|string|null $file = null, int $quality = -1): bool

https://psalm.dev/r/79c592fb26

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/79c592fb26

<?php declare(strict_types=1);

final class Image
{
    /**
     * @param resource $image
     * @param resource|string|null $file
     */
    public static function jpeg($image, $file = null, int $quality = -1): bool {
        return \imagejpeg($image, $file, $quality);
    }
}

Psalm output (using commit cccfe75):

ERROR: InvalidArgument - 10:27 - Argument 1 of imagejpeg expects GdImage, resource provided

ERROR: InvalidArgument - 10:35 - Argument 2 of imagejpeg expects null, null|resource|string provided

ERROR: InvalidReturnStatement - 10:16 - The inferred type 'false|string' does not match the declared return type 'bool' for Image::jpeg

ERROR: InvalidReturnType - 9:75 - The declared return type 'bool' for Image::jpeg is incorrect, got 'false|string'

[MauricioFauth]

Looks like Psalm thinks the return type is string|false if $file is null.

psalm/dictionaries/CallMap_80_delta.php

Lines 144 to 145 in cccfe75

	'imagejpeg' => ['bool', 'image'=>'GdImage', 'file='=>'string|resource|null', 'quality='=>'int'],
	'imagejpeg\'1' => ['string|false', 'image'=>'GdImage', 'file='=>'null', 'quality='=>'int'],

But according to the manual:

• file
  The path or an open stream resource (which is automatically being closed after this function returns) to save the file to. If not set or null, the raw image stream will be outputted directly.