The problem/use-case that the feature addresses

Our user wants to return score when querying the ranking through zrank, instead of querying through zscore again.

Currently, we can recommend users to use pipeline to solve this problem (avoid network waits), but I think this scenario should become a built-in feature of Redis, as it is so common.

Possible command formats:

1，

z[rev]rank key member [withscore]

2，

z[rev]rankwithscore key

Why not pipeline

For many clients, using pipeline not only requires accepting a new concept, but also requires adjustment in code, new pipeline class or other.