DataCollection to specify union types

[dnkmdg]

First of all, I love the package and have been using it for all my projects for quite some time now.

In my current project, I came across the need to specify union types for a DataCollection but noticed a lack of support for it.

Since a single array might sometimes contain a list of different entities, it would be very useful to be able to type these in the declaration. For example: #[DataCollectionOf(FilterItemData::class, FilterRangeItemData::class, FilterListData::class, FilterPriceItemData::class)].

I’ve resorted to using plain arrays for this, but it would be great to have native support for union types, as this situation arises from time to time.

Example:
A list of filters of different types:

class FilterListData extends Data
{
    public function __construct(
        public string $name,
        public ?string $type,
        public ?int $id,
        /**
         * @var array<FilterItemData|FilterRangeItemData|FilterListData|FilterPriceItemData>
         */
        public array $items,
    ) {}
}

A better way?

class FilterListData extends Data
{
    public function __construct(
        public string $name,
        public ?string $type,
        public ?int $id,
        #[DataCollectionOf(FilterItemData::class, FilterRangeItemData::class, FilterListData::class, FilterPriceItemData::class)]
        public array $items,
    ) {}
}