OpenApi style=form not possible anymore

[temp]

API Platform version(s) affected: 4.2.6

Description
After an upgrade to api-platform/core 4.2.6 our openapi query parameter definitions don't work as expected anymore We get a validation error with style=form

How to reproduce

            parameters: [
                'tags' => new QueryParameter(
                    key: 'tags',
                    schema: [
                        'type' => 'array',
                        'items' => [
                            'type' => 'string',
                            'uniqueItems' => true,
                            'enum' => ['A', 'B', 'C'],
                        ],
                    ],
                    openApi: new Parameter(
                        'tags',
                        'query',
                        description: 'Only return activities with the given comma-seperated tag(s)',
                        required: false,
                        style: 'form',
                        explode: false,
                        example: 'A,B
                    ),
                    nativeType: new BuiltinType(TypeIdentifier::ARRAY),
                ),
            ],

This is called with ?tags=A,B and throws this exception:

request.DEBUG: Uncaught PHP Exception ApiPlatform\Validator\Exception\ValidationException: "tags: This value should be of type array." at ParameterValidatorProvider.php line 98 {"exception":"[object] (ApiPlatform\\Validator\\Exception\\ValidationException(code: 0): tags: This value should be of type array. at .../vendor/api-platform/core/src/Symfony/Validator/State/ParameterValidatorProvider.php:98)

Possible Solution
Is there a way to get style=form serialization?

[temp]

Ok, got it working by moving the schema from the QueryParameter to the Parameter. and changing the native type to string. Can someone explain this?

            parameters: [
                'tags' => new QueryParameter(
                    key: 'tags',
                    openApi: new Parameter(
                        'tags',
                        'query',
                        description: 'Only return reasons with the given comma-seperated tag(s)',
                        required: false,
                        schema: [
                            'type' => 'array',
                            'items' => [
                                'type' => 'string',
                                'uniqueItems' => true,
                                'enum' => ['carhouse', 'roll_shelf', 'roll_shelf_deliver', 'roll_shelf_pickup'],
                            ],
                        ],
                        style: 'form',
                        explode: false,
                        example: 'carhouse,roll_shelf',
                    ),
                    nativeType: new BuiltinType(TypeIdentifier::STRING),
                ),
            ],

[soyuka]

Hi! Indeed the parameter native php type infers from your json schema. It's a very interesting use case, maybe that there's a bug and that with the form style we should force a nativeType to string + castToArray to false? Or even better we could parse that form style, how is your filter working ? could you share that?

https://github.com/api-platform/core/blob/main/src/Metadata/Resource/Factory/ParameterResourceMetadataCollectionFactory.php#L156