title: Redis sorted set wrong score
body: <p>Let's try this.</p>
  
  <pre><code>redis 127.0.0.1:6379&gt; zadd aaa 999999999999991.1 one
  (integer) 0
  redis 127.0.0.1:6379&gt; zscore aaa one
  "999999999999991.12"
  redis 127.0.0.1:6379&gt; zadd aaa 999999999999991.2 one
  (integer) 0
  redis 127.0.0.1:6379&gt; zscore aaa one
  "999999999999991.25"
  </code></pre>
  
  <p>Any solution?
  Thanks.</p>