Thanks! The process function runs as a Ray Actor (https://docs.ray.io/en/latest/ray-core/actors.html). So we have the same serialization requirements as Ray (https://docs.ray.io/en/latest/ray-core/objects/serialization...)

I think the most common limitation will be ensure that your output is serializable. Typically returning python dictionaries or dataclasses is fine.

But if you had a specific limitation in mind let me know happy to dive into it!