As you can see here. The comperation is with `FALSE` and not `false`. If you look in the [psr2](https://www.php-fig.org/psr/psr-2/#25-keywords-and-truefalsenull), you will see that it's wrong. https://github.com/thecodingmachine/safe/blob/a9415e4b4b71687d2200e1a5d98bc3933a0cc8ec/generated/eio.php#L24 Is that ok to have `FALSE`?
