[Bug]: Potentially wrong syntax for enum arrays

[darkbasic]

What happened?

The generated JSON specification for enum arrays is potentially incorrect.

How to reproduce the bug

Take the following code:

class AnalyticsDataRequest extends FormRequest
{
    /**
     * Get the validation rules that apply to the request.
     *
     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
     */
    public function rules(): array
    {
        return [
            'metrics' => ['nullable', 'array', Rule::in(MetricsEnum::values())],
            // ...
        ];
    }
}

It generates the following OpenAPI json:

{
    "name": "metrics",
    "in": "query",
    "required": true,
    "schema": {
        "type": "array",
        "enum": [
            "product_requirements_mandatory_completed",
            "product_requirements_optional_completed",
            "product_requirements_total_completed"
        ],
        "items": {
            "type": "string"
        },
        "minItems": 1
    }
},

In Stoplight it generates an enum array, as expected.
In openapi-typescript on the other hand it generates a union instead.

An openapi-typescript developer believes that the JSON specification is incorrect and should be the following instead:

{
  "name": "metrics",
  "in": "query",
  "required": true,
  "schema": {
    "type": "array",
    "items": {
      "type": "string",
      "enum": [
        "product_requirements_mandatory_completed",
        "product_requirements_optional_completed",
        "product_requirements_total_completed"
      ]
    },
    "minItems": 1
  }
}

This syntax works in both openapi-typescript and Stoplight.

Package Version

0.12.19

PHP Version

Will fill out later

Laravel Version

Will fill out later

Which operating systems does with happen with?

Linux

Notes

No response