clarify which zod features are supported

[uriva]

Confirm this is a feature request for the Node library and not the underlying OpenAI API.

• This is a feature request for the Node library

Describe the feature or improvement you're requesting

I would like to be able to use the zod enum field, and comments, and have the AI conform to these.

Additional context

No response

[RobertCraigie]

zod enums and descriptions (using z.describe()) should be supported, can you share a snippet that isn't working for you?

[uriva]

oh ok. I wasn't sure.
In that case maybe the docs should mention it?

[uriva]

seems like not all zod features are supported, e.g. union