Hello! I was using this library with the Vertex AI backend and ran into occasional 500 / INTERNAL errors that manifest as:

iterateResponseStream: invalid stream chunk: { "error": { "code": 500, "message": "Internal error encountered.", "status": "INTERNAL" } }

AFAICT, these errors are being handled and re-surfaced as unstructured errors here:

Is there any reason that these aren't returned as structured APIErrors? That would make it possible for users of this library to retry on such errors.

Thanks!