HTML-Element file throws warning in strict mode

When using HTML-Element "file" in a standard moodle form there is a strict standards warning thrown, because the implementation integrated from pear is missing the parameter $values:

Strict Standards: Declaration of HTML_QuickForm_file::_findValue() should be compatible with HTML_QuickForm_element::_findValue(&$values) in C:\Users\Admin\xampp183\htdocs\ecommunity\lib\pear\HTML\QuickForm\file.php on line 346

I know, that using the "file" Element is not recommended, but there might be situations (like uploading a file in the filepicker dialogue), where you might not like to use the fliemanager (as for us by developing a new repository plugin).

I like to suggest to add the parameter of the inherited method _findValue() in /lib/pear/HTML/QuickForm/file.php as follows to match strict standards.

function _findValue(&$values = array()) {