On Aug 26, 2015, at 11:03 AM, Raul-Sebastian Mihăilă wrote:
> In 9.1.11. it's specified that the iterator returned by the [[Enumerate]]
> method iterates over String-valued keys. But the informative definition at
> the end of 9.1.11. is based on whatever is returned by calling
> Reflect.enumerate on the prototype of the current object, assuming that there
> is such a prototype.
>
> If the prototype is a proxy and it's enumerate trap returns an iterator that
> yields other kind of values than strings, then our original object's
> [[Enumerate]] method will give us non-string keys as well. And they can be
> any kind of values, not only symbols.
And the prototype [[Enumerate]] could return the same value multiple times,
which would also be a violation of the normative requirments expressed in 9.1.11
The final if statement in the informative algorithm should probably be replaced
by:
```js
if (!visited.has(protoName) && typeof protoName === "string") {
visited.add(protoName);
yield protoName;
}
```
I opened a bug for this: https://bugs.ecmascript.org/show_bug.cgi?id=4531
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