ZMSCORE key member [member ...]
Time complexity: O(N) where N is the number of members being requested.
ACL categories: @read, @sortedset, @fast
Returns the scores associated with the specified
members in the sorted set stored at
member that does not exist in the sorted set, a
nil value is returned.
Array reply: list of scores or
nil associated with the specified
member values (a double precision floating point number),
represented as strings.
dragonfly> ZADD myzset 1 "one"
dragonfly> ZADD myzset 2 "two"
dragonfly> ZMSCORE myzset "one" "two" "nofield"