B.3.1 The __proto__ pseudo property

Andreas Rossberg rossberg at google.com
Tue Apr 23 08:18:22 PDT 2013

On 23 April 2013 17:10, Mark S. Miller <erights at google.com> wrote:
> [*] I say "probably" to hedge my bets. The hard constraint we absolutely
> require is already guaranteed by ES5: That the [[Prototype]] of a
> non-extensible object cannot be mutated.

I'm confused now. How does ES5 guarantee that?


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