Issue with Google structured response

[rsJames-ttrpg]

To Reproduce:
A request with the schema property fails with a 400
One without succeeds.
Same API Key same code just removed the schema property on the request

        let builder = LLMBuilder::new()
            .backend(self.model.provider())
            .api_key(&self.api_key)
            .model(self.model.to_string())
            .max_tokens(self.max_tokens)
            .temperature(self.temperature)
            .stream(false)
            .system("DO thing")
            .schema(output_schema);

fails with 400

        let builder = LLMBuilder::new()
            .backend(self.model.provider())
            .api_key(&self.api_key)
            .model(self.model.to_string())
            .max_tokens(self.max_tokens)
            .temperature(self.temperature)
            .stream(false)
            .system("DO thing");

That does the thing.
This is using gemini-2.0-flash with which I have verified works with curl.

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent?key=$GOOGLE_KEY" -H 'Content-Type: application/json' -d '{
      "contents": [{
        "parts":[
          { "text": "List a few popular cookie recipes, and include the amounts of ingredients." }
        ]
      }],
      "generationConfig": {
        "responseMimeType": "application/json",
        "responseSchema": {
          "type": "ARRAY",
          "items": {
            "type": "OBJECT",
            "properties": {
              "recipeName": { "type": "STRING" },
              "ingredients": {
                "type": "ARRAY",
                "items": { "type": "STRING" }
              }
            },
            "propertyOrdering": ["recipeName", "ingredients"]
          }
        }
      }
}' 2> /dev/null | head

It works for Anthropic and Deepseek v3-coder
Not tried with Open AI

[rsJames-ttrpg]

I got somewhat to the bottom of this. The google schema is a sub set of json schema. Could do with some kind of validation / transformation on a given schema.