title: Redis - setex - value is not an integer or out of range
body: <p>The following used to work fine:</p>
  
  <p><code>redis_client.setex(key, expiry_in_sec, value_json)</code></p>
  
  <p>And now it suddenly returns: </p>
  
  <p><strong><em>value is not an integer or out of range</em></strong></p>