Error messages for incorrect "in" and "new" operands always displays "undefined" as type

[kpreisser]

Hi,
this is a follow-up issue to #59. The error messages for incorrect in and new operands always display undefined as actual type:

'toString' in 5;
// TypeError: The in operator expected an object, but found 'undefined' instead

new (String('five'));
// TypeError: The new operator requires a function, found a 'undefined' instead

Thanks!