Hotfix: php7 has no return type "mixed"

[sreichel]

Description (*)

#2802 made some changes for php8, but was not tested with php7.

Problem: return type mixed was added with php8 .... https://php.watch/versions/8.0/mixed-type

This is fixed with this PR.

Reverted phpstan config to run with composer platform version (PHP7.3). Sadly phpstan does not detect that ...

Reported issue here: phpstan/phpstan#8597

Related Pull Requests

1. Updated lib/Varien for PHP8.1 #2802
2. Set php version for phpstan #2692

Fixed Issues (if relevant)

Fatal error: Uncaught TypeError: Return value of Varien_Object::offsetGet() must be an instance of mixed, string returned in /var/www/html/lib/Varien/Object.php:876

Manual testing scenarios (*)

1. use php7 ... :/
2. open frontend page ...

Questions or comments

Wonder that is not covered by code checks.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)
• Add yourself to contributors list

[fballiano]

I’ll test and make another hotfix release

[elidrissidev]

The PR that introduced mixed type was merged just 2 days ago, after the last release, so I think no need to do another one.

[fballiano]

Oh great thank you