__proto__ in Annex B (was: Re: Sep 27 meeting notes)

[John-David Dalton]

> It is a standard (de-facto), we were just talking about making a non-mandatory normative spec for it. That does carry some weight but
> not much more than the de-facto standard, IMHO.

A non-mandatory normative spec, like that of String#substr (even
though JScript implementation is diff) would rock!
Current implementations of __proto__ differ on how they handle `null` values.
I believe FF won't allow it to be set again once it is nulled while
others allow it to be set again.

- JDD