For all users still using PHP 7.3 – 7.4:

I back-ported all features and fixes not breaking the upgrade procedure from the 6.1 branch to 6.0.38.

• 6.0.38 change log

I run a few tests locally with an old XAMPP supporting PHP 7.3 running on a virtual machine, but it's almost certain I've missed something.

Please report back if something breaks.