Relationship between globals, Realms, and global environment records

[Boris Zbarsky]

On 11/25/14, 2:48 PM, Allen Wirfs-Brock wrote:
> It would be trivial to change the ES spec. to allow for the script this binding and global object to be set to independent value when a Realm is created.

I think we do want this, but that's not enough, unfortunately.  Consider 
this script, executed at toplevel:

   Object.defineProperty(Object.prototype, "foo", { get: function() { 
return this; } });
   var z = foo;

Is z a Window or a WindowProxy?  In browsers, as far as I can tell, it's 
interoperably a WindowProxy.  I put a testcase at 
http://web.mit.edu/bzbarsky/www/testcases/windowproxy/getter-on-proto-chain-root.html 
if people want to take a look.  This wouldn't be covered by the "script 
this binding" bit, though, or would it?

-Boris