refactor: [5.x] mixed types & trailing comma

[DjordyKoert]

Description

Adds mixed php type in code & allows trailing comma's to be used in PHP-CS-Fixer

What type of PR is this? (check all applicable)

• Bug Fix
• Feature
• Refactor
• Deprecation
• Breaking Change
• Documentation Update
• CI

Checklist

• I have made corresponding changes to the documentation (docs/)
• I have made corresponding changes to the changelog (CHANGELOG.md)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.49%. Comparing base (4e94b3a) to head (4be027c).
Report is 1 commits behind head on 5.x.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##              5.x    #2396   +/-   ##
=======================================
  Coverage   95.49%   95.49%           
=======================================
  Files          71       71           
  Lines        2577     2577           
=======================================
  Hits         2461     2461           
  Misses        116      116           

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