2013/1/2 Allen Wirfs-Brock <al...@wirfs-brock.com>
>
> Symbols don't need to fail on [[PreventExtensions]]. It always succeeds
> for them since they are born non-extensible.
>
Sounds reasonable.
> The major user facing change here is the possibility that
> Object.preventExtensions will through if the object can not be made
> non-extensible. This wasn't specified in ES5, but I'm ok making that
> change.
>
Ok. Recall that in the old Proxy API, we already had the fix() trap
returning a boolean, and Object.{preventExtensions,seal,freeze} throwing on
false.
Cheers,
Tom
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