On Fri, Oct 5, 2012 at 11:23 AM, Mark S. Miller <erig...@google.com> wrote:
> On Fri, Oct 5, 2012 at 7:11 AM, Sam Tobin-Hochstadt <sa...@ccs.neu.edu>
> wrote:
>>
>>
>> Note also that `Symbol.for` has some really weird behavior. For
>> example, what does this evaluate to?
>>
>> Symbol.for("x") instanceof Symbol
>>
>> That depends if someone has previously evaluated `Symbol.for("x")` in
>> a different frame.
>
>
>
> If this is true, then it is obviously a fatal problem with the whole
> proposal, independent of all other issues. Do symbols have a [[Prototype]]
> whose value is a Symbol.prototype?
There are actually a couple other options here:
- Symbol values have no prototype (thus the expression above is always false)
- The `Symbol` prototype is shared across all frames (but what is its
prototype?)
--
sam th
sa...@ccs.neu.edu
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