Openai Function calling, Azure/oai support and llamacpp grammar

[AriMKatz]

Hi,

I have a few questions about guidance please:

1. Does guidance support openAI function calling in general and for json generation?
2. Does guidance utilize llamacpp grammars?
3. Which features are disabled or don't work well in production for each of OpenAI and Azure? Docs mention the most powerful features don't work well, what does that mean in practice, roughly ?

Thanks!