Action proxies

[Brendan Eich]

David Bruant wrote:
> About the performance argument, I think a performance argument can 
> only be made in comparison with what we have and not in absolute terms.

Agreed, and I wrote taking that into account.

> What's at stake with notification proxies is getting rid of invariant 
> checks [1]. For some applications, the cost of invariant check is too 
> much too. 

Too much for what applications, based on what measure?

See Sam's followup with paper reference. Allocation is always costlier 
than JIT-optimized hidden-class-indexed fast paths, summing direct and 
indirect effects.

/be