Proxying built-ins (Was: [[Invoke]] and implicit method calls)

Mark S. Miller erights at
Wed Sep 25 12:50:09 PDT 2013

That's why I picked on Date. We need to distinguish formerly-internal
potentially-public state from genuinely private state. WeakMap is
(ironically) a great example of an abstraction whose internal state must
remain private.

On Wed, Sep 25, 2013 at 7:22 AM, David Bruant <bruant.d at> wrote:

> Le 25/09/2013 15:49, Mark S. Miller a écrit :
>  Why does Date need private state? AFAICT, it only needs uniquely named
>> state. Why not do what we've done for many other bits of internal state
>> that doesn't need to be private: just name it with a unique symbol?
> yes (assuming unique symbols are a thing in the end. I think there were
> threatened. unique string could work though)
>  This doesn't work for all internal state of course
> yes. I think that in all this discussion, Date is a representant of
> built-ins that have private state. WeakMap internals really can't be
> exposed as unique properties for instance.
> David

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