title: Updating Sorted Set with Redis
body: <p>Currently I am trying to update a sorted set member.  Looking at the docs, using <code>ZADD</code> appears that it should update a member if its score already exists.  However, upon using this code to try to update a member,</p>
  
  <pre><code>db.zadd("users", parseInt(key, 10) + 1, JSON.stringify(newData));
  </code></pre>
  
  <p>....a new entry is added even if a score already exists!  How to I update a sorted set member with redis?</p>