According to 19.1.3.6 Object.prototype.toString() [1], it's possible to
do this:
```js
function Foo(){}
Foo.prototype[Symbol.toStringTag] = "Null";
Object.prototype.toString.call(new Foo()); // "[object Null]"
```
It seems like `"Null"` and `"Undefined"` should be added to the step
17(b) list of exceptions to prevent spoofing of null and undefined
values using this approach.
I couldn't think of a reason why the current behavior would make sense,
but if I'm off base, feel free to correct me. :)
[1]:
https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.prototype.tostring
--
___________________________
Nicholas C. Zakas
http://www.nczonline.net
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