It seems like we would always want the id as a string. What do you think about calling the `to_s` in [`TweetStatus#tweet_id`](https://github.com/rubyrogues/rubyfriends/blob/2d189def3e934820a5b82eed49c0e935e4f6d2d1/lib/tweet_status.rb#L24) instead so we can drop the comment here?