If you type the word "havent" spell check grabs you by the short and curlies saying your wrong.
But,,,, if you type "haven't" it's perfectly ok.
One single key strike between correct and in correct,,,,,,,,,,, so you may as well have typed "have not" in the first instance and be done with.
![Unknown :unknown:](./images/smilies/new-unknown.gif)
![Crazy :crazy:](./images/smilies/new-crazy.gif)
![Crazy :crazy:](./images/smilies/new-crazy.gif)