Sending reads to replica nodes on non-zero db not possible?

[lazorfuzz]

Expected Behavior

I am using Sentinel with 1 primary and 2 replicas. I want to send read-only commands to the replicas, on ANY DB number, not just DB 0.

Current Behavior

Today, looks like it's not possible to do this with FailoverClient. If I switch to FailoverClusterClient it will work, but it forces me to use DB 0. Since I am not using Redis Cluster, I should be able to use the other DBs, but this is not supported.

I saw some PRs and discussion in the past that apparently add support for this, but I'm not able to find it in either v8 or v9:
#1199

A possible fix was suggested here, but no maintainers have responded:
#2824

Frankly it is surprising that go-redis doesn't seem to support this, while other Redis libraries for other languages have long supported this. Am I just missing something? Please advise, thanks.