Summary of a problem or a feature request

When using code similar to shown below phpstan generates error

Strict comparison using === between array and false will always evaluate to false

Code snippet that reproduces the problem

$m = new Memcached();
if ($m->getAllKeys() === false) {
	//
}

Expected output

No error should be reported since the method can return false on failure.

http://php.net/manual/en/memcached.getallkeys.php