Request serialziation behavior

[WildEgo]

Hey guys!
I've faced some weird behavior that I do not know if is intended or not, I'll leave a repo with the reproduction of the behavior below: https://github.com/WildEgo/larave-post-parse-reproduction

More information:
I'm sending a request to Laravel with the following content from my javascript frontend

{
  "message": "Cool comment",
  "personInCharge": 9,
  "type": 1,
  "complain": 123,
  "options": {},
  "endDate": "2022-08-03T00:00:00.000Z",
  "startDate": "2022-07-03T00:00:00.000Z",
  "media": [
    1,
    2,
    {} <- This is a file
  ],
  "_method": "put"
}

Which is correctly handled by the frontend and sent as a multipart/form-data request as the one depicted below (do not that I deleted a lot of the image content in order to keep this easily readable

-----------------------------7414398502639581653517862015
Content-Disposition: form-data; name="message"

Cool comment
-----------------------------7414398502639581653517862015
Content-Disposition: form-data; name="personInCharge"

9
-----------------------------7414398502639581653517862015
Content-Disposition: form-data; name="type"

1
-----------------------------7414398502639581653517862015
Content-Disposition: form-data; name="complain"

123
-----------------------------7414398502639581653517862015
Content-Disposition: form-data; name="endDate"

2022-08-03T00:00:00.000Z
-----------------------------7414398502639581653517862015
Content-Disposition: form-data; name="startDate"

2022-07-03T00:00:00.000Z
-----------------------------7414398502639581653517862015
Content-Disposition: form-data; name="media[]"

1
-----------------------------7414398502639581653517862015
Content-Disposition: form-data; name="media[]"

2
-----------------------------7414398502639581653517862015
Content-Disposition: form-data; name="media[]"; filename="GitHub Ionia Logo.png"
Content-Type: image/png

�PNG
�
-----------------------------7414398502639581653517862015
Content-Disposition: form-data; name="_method"

put
-----------------------------7414398502639581653517862015--

But when dumping said request the result I get is the following

[2022-07-04 11:28:02] local.INFO: array (
  'message' => 'Cool comment',
  'personInCharge' => '9',
  'type' => '1',
  'complain' => '123',
  'endDate' => '2022-08-03T00:00:00.000Z',
  'startDate' => '2022-07-03T00:00:00.000Z',
  'media' => 
  array (
    0 => 
    Illuminate\Http\UploadedFile::__set_state(array(
       'test' => false,
       'originalName' => 'GitHub Ionia Logo.png',
       'mimeType' => 'image/png',
       'error' => 0,
       'hashName' => NULL,
    )),
    1 => '2',
  ),
  '_method' => 'put',
) 

In the media there was supposed to be [1, 2, File] instead what I'm getting is [File, 2].

Is this intended behavior?

Context:
OS: Arch Linux [5.18.9-arch1-1]
PHP Version: PHP 8.1.7

Regards,
Luis Bizarro.

[WildEgo]

So I seem to have found the code that is causing me this problem, I have found a solution but it fails testing due to the array keys being modified, I do not know to what point that'd matter but the fact is that it fails the tests.

The problem line is this and would be fixed with array_merge_recursive for my use case (still failing tests) as opposed to array_replace_recursive

The failed test is Illuminate\Tests\Http\HttpRequestTest::testAllInputWithNumericKeysReturnsInputAfterReplace

Edit:
Changing the assertEqual() instances to assertEqualsCanonicalizing(), does seem to fix the tests but it doesn't change the fact that the keys do change and would be considered a breaking change.

Regards,
Luis Bizarro.