Why https://wiki.php.net/rfc/array-to-string should not pass

test.php

<?php

function doSomeStuff($myArg) {
    if (!is_string($myArg)) {
        // Will break if it passes and $myArg is an array while not being business logic but pure logging
        trigger_error("Wrong data passed: $myArg", E_USER_NOTICE);
    }

    // Rest of the function
}