filterVal not correct working with FILTER_VALIDATE_INT

If using filterVal with FILTER_VALIDATE_INT and validate (0, '0') its returns false, but should returns true;

Example:

$data = '0';
var_dump(var_dump(v::filterVar(FILTER_VALIDATE_INT)->validate($data));

returns false

But if will try to use php's filterVal:

$data = '0';
var_dump(filter_var($data, FILTER_VALIDATE_INT) !== false);

returns correct true.