public function hasExactKeys($keys, &$unexpected = null, &$missing = null)
{
if (func_num_args() > 1) {
$r = a::hasExactKeys($this->value, self::unwrap($keys), $unexpected, $missing);
$unexpected = new self($unexpected);
$missing = new self($missing);
return $r;
} else {
return a::hasExactKeys($this->value, self::unwrap($keys));
}
}