Is “class C extends null” derived?

extends null is “derived” in ES2015.

class C extends null {
}

Constructor kind: derived
Prototype of C: Function.prototype
Prototype of C.prototype: null

via 15. Classes - Exploring ES6

But, @allenwb said:

I think it is a specification bug that extend null classes were marked as “derived”
– https://github.com/tc39/ecma262/issues/543#issuecomment-210191577

Edit(2016-04-20): ECMAScript spec is fixed.

• Normative: Set this appropriately for class extends null · tc39/ecma262@98c67f2
• Normative: Use proper default constructor with class extends null · tc39/ecma262@a35f0f3

If you interstend in the specification bug, please follow these issues:

• extends null · Issue #543 · tc39/ecma262
• constructor-super - super() must be called even if the class extends null · Issue #5449 · eslint/eslint