Description

Validation groups is often predefined set of strings. Seems like it make sense to use enum for this. Probably backed string enums.
Right now there is an error if you try to use enums for groups.

TypeError : Illegal offset type
vendor/symfony/validator/Mapping/GenericMetadata.php:167

Example

enum MyEnum: string
{
    case CASE_ONE = 'CASE_ONE';
    case CASE_TWO = 'CASE_TWO';
}

#[Assert\Callback(groups: [MyEnum::CASE_ONE])]
class Foo
{    
}