Global lexical tier

[Jason Orendorff]

On Aug 31, 2015, at 7:11 PM, Brendan Eich wrote:
>
> We are in rapid-release hell/heaven.
>
> This means errata can be issued, and engines can implement the better
> resolution for those errata, compared to what the last major-version _de
> jure_ spec mandated.

Yes. Obviously the bar is very, very high.

I'd like to hear from other implementers on whether this is worth
considering at all. I think the change would be backward-compatible
except for code that depends on redeclaration errors, or on variables
*not* being reflected on the window object.

-j