Validation, is it even working ?

I've created a class, below, which has been decorated to set the type and the maximum length.

public class Test
{
[OpenApiProperty(Nullable = true, Description = "The unique message id of the request")]
[DataType(DataType.Text)]
[StringLength(10, MinimumLength = 1, ErrorMessage = "Eeeek")]
public string ExternalRef { get; set; }
}

In the progam.cs if I set the Openapi version to Version 2

var options = new OpenApiConfigurationOptions()
{
OpenApiVersion = OpenApiVersionType.V2,
}

The Swagger GUI will let me enter a string up to the Maximum length, and pass the call to to the azure function. :)
If I exceed the Maximum length the the Swagger GUI does nothing, no errors or change of colour, nothing. :(

If I update the OpenApiVersion to Version 3
Then every time, whether the string is shorter or longer than the maximum length the call will be passed to the azure function :(

Just for completeness my function is below

[Function("Function2")]
[OpenApiOperation(operationId: "Function2")]
[OpenApiRequestBody(contentType: "application/json", bodyType: typeof(Test), Description = "Test Object", Required = true)]
[OpenApiResponseWithBody(statusCode: HttpStatusCode.OK, contentType: "text/plain", bodyType: typeof(string), Description = "The OK response")]
public HttpResponseData Function2([HttpTrigger(AuthorizationLevel.Anonymous, "post")] HttpRequestData req)
{
_logger.LogInformation("C# HTTP trigger function processed a request.");

using var bodyReader = new StreamReader(req.Body);
var body = bodyReader.ReadToEndAsync().Result;

var data = JsonConvert.DeserializeObject(body);

var response = req.CreateResponse(HttpStatusCode.OK);
response.WriteStringAsync("Hello!!! " + data.ExternalRef);
return response;
}

This is a Isolated Azure Function V4 .Net 8

What I'd like to know:-
1, How do I set my openapi configuration so that the swagger GUI obeys the schema restrictions.
2, How do I set the openapi configuration so that the swagger GUI will indicate that something is wrong.

Thanks

Reproduce the report using the OpenApiConfigurationOptions in Program.cs, the Test model's OpenApiProperty, DataType, and StringLength attributes, and the Function2 HTTP trigger. Compare the generated Swagger UI behavior for OpenAPI V2 and V3, then inspect the resulting schema and request handling. Done means the documented length restriction and invalid-input indication behave as expected in the supported configuration.

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