# Fix fatal (PHP8.X) type issue with abs, and amend dol_eval return type
I got the following message:
`Fatal error: Uncaught TypeError: abs(): Argument #1 ($num) must be of type int|float, string given in D:\mdeweerd\workspace\dolibarr\htdocs\projet\list.php on line 233`
I examined the phan report and there was no mention of this because dol_eval was
said to return mixed.
In order to detect such cases, I amended the dol_eval return type to ensure to find
most of the locations where a cast is needed.