zrange with scores gives confusing results when duplicate scores are present #85
Description
When all the elements of a zset have unique scores, the OrderedCollections.OrderedSet returned by zrange(conn, zsetname, 0, n, :withscores) makes sense:
julia> zadd(r, "zsettest", 1, "one")
1
julia> zadd(r, "zsettest", 2, "two")
1
julia> zrange(r, "zsettest", 0, 1, :withscores)
OrderedCollections.OrderedSet{AbstractString} with 4 elements:
"one"
"1"
"two"
"2"But when there are multiple entries with the same score, the duplicate scores are not duplicated in the returned OrderedCollections.OrderedSet (because it is a set after all):
julia> zadd(r, "zsettest", 1, "three")
1
julia> zrange(r, "zsettest", 0, 2, :withscores)
OrderedCollections.OrderedSet{AbstractString} with 5 elements:
"one"
"1"
"three"
"two"
"2"One way to fix this would be for the elements of the OrderedSet to be value => score or pairs or (value, score) tuples. I think that would allow the return type still to be OrderedSet while not creating ambiguity about which is value and which is score (e.g. when values and scores look alike), but it would definitely be a breaking change compared to the current (arguably broken) behavior. FWIW, this is what redis-cli returns:
$ redis-cli
127.0.0.1:6379> ZRANGE zsettest 0 2 withscores
1) "one"
2) "1"
3) "three"
4) "1"
5) "two"
6) "2"