Comment #3 on issue 3568 by [email protected]: Generator Prototype should
have an object between itself and Object.prototype
https://code.google.com/p/v8/issues/detail?id=3568
As noted in issue 3897, this is a problem with *all* iterator prototypes
(not just for generators).
25.1.2 The %IteratorPrototype% Object
The value of the [[Prototype]] internal slot of the %IteratorPrototype%
object is the
intrinsic object %ObjectPrototype% (19.1.3). The %IteratorPrototype%
object is an
ordinary object. The initial value of the [[Extensible]] internal slot of
the
%IteratorPrototype% object is true.
NOTE All objects defined in this specification that implement the
Iterator interface
also inherit from %IteratorPrototype%. ECMAScript code may also define
objects that
inherit from %IteratorPrototype%. The %IteratorPrototype% object provides
a place
where additional methods that are applicable to all iterator objects may
be added.
The following expression is one way that ECMAScript code can access
the %IteratorPrototype% object:
Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()))
(source:
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-%iteratorprototype%-object)
but in V8 today, this value is the ObjectPrototype itself:
d8> Object.prototype ===
Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()))
true
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