[Form] BC break in choice based form type extensions #20771
Description
3.2 changed the way that choice based types load choices. They now use choice_loader instead of choices. This caused all type extensions which used to override choices to break, because the choice loader takes priority.
As a simple fix we can add 'choice_loader' => null, as default to our extensions.
Effected types are:
CountryTypeCurrencyTypeLanguageTypeLocaleTypeTimezoneType
Since not many of us write extensions for these types, and providing BC for this might be hard, I'm leaving this note for others to save some debug time :)