Can't use array as a cache key from thin clients (ignite-9991)

[Alexey Kosenchuk]

The problem is reproduced with Java, NodeJs, PHP, Python thin clients.

This seems the server's issue.

Can an expert in the server have a look, please?

The details are in the jira [1]

Thanks,
-Alexey

[1] https://issues.apache.org/jira/browse/IGNITE-9991