From Github issue #75:

While running https://github.com/sstalle/php7cc - spotted this:

{{File: mod/questionnaire/classes/question/numeric.php > Line 28: Name "numeric" that is reserved for future use (does not cause an error in PHP 7) used as a class, interface or trait name class numeric extends \mod_questionnaire\question\base { } }}

As the error says, it won't cause an error, but if you want to future proof your code, you will need to rename the class. Cheers!