Fixed calling getPrototypeOf(null)

[Cerberus]

I tried to make a simple solution to fix #154.

[mrbbot]

Thank you very much for the PR! 😃 Looks like this is because even though Type(null) is Null, typeof null is "object": https://tc39.es/ecma262/multipage/ecmascript-language-expressions.html#table-typeof-operator-results, oops. 🙃

Would you be able to move the === null check to just under 3. If Type(O) is not Object..., so it follows the spec?

  if (typeof O !== "object" && typeof O !== "function") return false;
+ if (O === null) return false;

I think we can use === instead of == here as typeof undefined is actually "undefined", so will fail the first check.

[mrbbot]

Awesome! Thank you! 🎉

[mrbbot]

Hey! 👋 I've just released version 2.2.0 including this fix. You can find the full changelog here.