On May 16, 2011, at 11:40 AM, Brendan Eich wrote:

> Frozen objects are not observably extensible. I argued that we want an 
> implementation option to put their shallowly-frozen state (values at least) 
> in read-only memory. I have not seen anything like an argument why this 
> option should be forbidden.

And (sorry for followup) in particular, there's no argument for frozen objects 
as weak map keys needing to sprout mutable private-named properties. We have an 
existence proof to the contrary.

/be
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