When running in cluster mode, passing references does not work, e.g.,:

auto r3 = Ray::Task(Return1).Remote();
auto r4 = Ray::Task(Plus1, r3).Remote(); // passing r3 as reference argument

CC @SongGuyang

• I have verified my script runs in a clean environment and reproduces the issue.
• I have verified the issue also occurs with the [latest wheels](https://docs.ray.io/en

PrestoDB https://prestodb.io .. is widely used as SQL frontend for many different data-sources, including ElasticSearch, and even files in S3 .. would be very nice if there would be a Connector available for Vespa.

Currently the way that the predict function converts the incoming data and more importantly the return statement is quite obscure, and the community tends to just look at the util.py functions, however they shouldn't have the need to read the source to know what rules apply. For this it would be useful to ahve a table or a high level overview of the rules that apply in regards to what data types g