Hi, i've been reading ECMAScript specification recently. I've learned that 
Object.prototype.toString will generate a string like [object <[[Class]]>] 
for objects.
And I'm curious how can I customize the [[Class]] internal property for my 
objects. Or shall i just rewrite this method and fake this behavior?

By the way, in Chrome when <this> is the window object,
this.toString() => "[object window]"
but
Object.prototype.toString.call(this) => "[object global]"
Hey...The app i'm writing has a similar behavior and will use the global 
object in a similar way, how shall i avoid [object global] appearing? I 
want to ensure (at least pretend) its [[Class]] internal property is 
"window" etc.

Looking forward for advice. Thanks.

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