OpenAPI::Client - how to pass additionalProperties in OpenAPI GET query request?

I'm trying to pass filter variables in a GET request to an OpenAPI route with this specification:

```
- in: query
name: params
schema:
type: object
additionalProperties:
type: string
style: form
explode: true
```
I've tried various different ways of passing the data at request time:
```

my $client = OpenAPI::Client->new(...);

my $tx = $client->findApps({
params => { 'id' => '1' }
});

my $tx = $client->findApps({ 'id' => '1' });

```
What is the correct way to do this?

I'm currently getting this warning/error:

Use of uninitialized value $name in exists at /usr/local/share/perl/5.26.1/OpenAPI/Client.pm line 204