code: func (c *asyncClient) Zscore(arg0 string, arg1 []byte) (result FutureFloat64, err Error) {
  	arg0bytes := []byte(arg0)
  	arg1bytes := arg1
  
  	var resp *PendingResponse
  	resp, err = c.conn.QueueRequest(&ZSCORE, [][]byte{arg0bytes, arg1bytes})
  	if err == nil {
  		result = newFutureFloat64(resp.future.(FutureBytes))
  	}
  	return result, err
  
  }
docs: // Redis ZSCORE command.