RPC calls to multiple services with round robin DNS lookup

When I do something like `await rpc.connect_rpc(connect='tcp://rpc-service:5555')`, where "rpc-service" is a round robin A record with multiple addresses, can I expect the client to choose a different address every time it is initialized?

From experimentation it seems that this is not the case, but I might be doing something wrong.

Start by tracing the connect_rpc(connect='tcp://rpc-service:5555') entry point and checking how hostname resolution is handled during client initialization. Compare that behavior with the expected round-robin A-record behavior and document or reproduce the result; done means the initialization behavior is clearly established and any required change is scoped.

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