code: func (c *cachedLoader) MustGetString(key string) string {
  	b, err := c.Get(key)
  	if err != nil {
  		panic(fmt.Sprintf("Could not fetch config (%s) %v", key, err))
  	}
  
  	var s string
  	err = json.Unmarshal(b, &s)
  	if err != nil {
  		panic(fmt.Sprintf("Could not unmarshal config (%s) %v", key, err))
  	}
  
  	return s
  }
docs: // MustGetString fetches the config and parses it into a string.  Panics on failure.