Upgrading from older versions

Coming from v7 to v8?

Make sure you ran bin/cake migrations migrate -p Queue to migrate DB schema for all previous migrations before upgrading to v8.
Once upgraded also run it once more, there should be now only 1 migration left.
Make sure you are not using PHP serialize anymore, it is now all JSON. It is also happening automatically behind the scenes, so remove your manual calls where they are not needed anymore.

That includes the config
```
'serializerClass' => ..., // FQCN
```
etc

If you are upgrading from Cake3/4 and v5/v6, make sure to install v7 firs, run all migrations, then jump to v8.