I have a doubt regarding the maximum length of a Tweet: if a user enters an URL which is shorter than its t.co wrapper's length, and the Tweet has 140 characters including such URL, after the URL is switched for its t.co wrapper the length of the Tweet would be longer than 140 characters.
What would the system do in those cases? Would the length of the Tweet be truncated to 140 characters? Or would the final Tweet be longer that 140 characters?
Should I consider 140 characters for the storage of the text in a Tweet? Or should I consider more characters?