TOTALLY off topic and I truly apologize but I believe this is where I'll get the answer the quickest:

If, in a Redis sorted set, two values have the same score, retrieving a range of values that includes those two values will present them in the alphabetical order right? So in this way one of those two values with score can be cut out of the retrieval by limiting the range appropriately. This leads me to believe that each value in a sorted set should have a unique score even though the uniqueness is not forced or encouraged in any way at the point of value/score assignment. What would be a real-world use case scenario for such a structure then when?