Request for help serializing union types

[gijs-blanken]

Hi!

I'm currently working on rewriting the PHP Laravel OpenAPI generator (merge request here). I was planning on using this package to handle serialization and deserialization. However, I'm running into an issue and I was hoping you could help me!

I am generating classes such as this one for OpenAPI schemas which specify an oneOf.

#[Serde\ClassSettings(renameWith: Cases::snake_case)]
class GetClientProducts200Response
{
    public function __construct(
        public \OpenAPI\Server\Model\ClientProduct|\OpenAPI\Server\Model\ClientCustomPackage $getClientProducts200ResponseInner,
    ) {}
}

And in my generated controller I will then try and serialize it using Serde:

if ($apiResult instanceof \OpenAPI\Server\Model\GetClientProducts200Response) {
    return response()->json($this->serde->serialize($apiResult, format: 'array'), 200);
}

However, Serde currently does not support serializing union types. Could you think of a workaround for this use case? I'd really like to use this package in the generator.

Thanks in advance!
Gijs