realpath mit strict_types

realpath2.php

<?php

declare(strict_types = 1);

$path = 'foobar';
var_dump($path);

$path = realpath($path);
var_dump($path);

$path = realpath($path);
var_dump($path);

string(6) "foobar"
bool(false)

Fatal error: Uncaught TypeError: realpath() expects parameter 1 to be a valid path, boolean given in -:11
Stack trace:
#0 -(11): realpath(false)
#1 {main}
  thrown in - on line 11