Benjamin (Inglor) Gruenbaum wrote:
> Why not? The generator would switch on sent value, in a loop.

Well, let's say we have an iterator that does nothing once, returns what was sent to it the first 5 times and then is done:

```js
function* gen(){
  var res = yield;
  for(var i = 0; i < 5; i++){
    res = yield res;
  }
}

var iter = gen(), res = {}, i = 1;
iter.next();
do {
  res = iter.next(i++);
  console.log(res.value);
} while(!res.done);
```

How would you clone that with a switch?

The switch has to go on the inside -- the generator author has to cooperate with client code to make something that can be "cloned".

It could be this is too great a hardship, but we need more evidence, not contrived examples.

/be
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