Comment #2 on issue 3391 by [email protected]: Arguments objects should have
@@iterator == ArrayValues own property
http://code.google.com/p/v8/issues/detail?id=3391
This property is on the arguments instances, as it has no prototype, so
there's no easy place to monkeypatch. I guess we can mutate the native
context's arguments maps within the bootstrapper...
Then there is the question of iteration order. The current spec has
@@iterator between length and callee; that's probably too much work to
change.
Tentative plan: see if @@iterator can be implemented as a callbacks
property. The getter would return ArrayValues, captured at bootstrap
time. The setter would remove the callback property and instead add a
normal property. At bootstrap time, if harmony iteration is enabled, we
monkeypunch the sloppy, aliased, and strict arguments boilerplate maps to
add the @@iterator callbacks property.
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