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See discussion in <http://logbot.glob.com.au/?c=mozilla%23content&s=18+Sep+2012&e=18+Sep+2012>.
Is this still what you want heycam?
I think as filed and in full generality this is not web compatible. I'm 99% sure people put expandos on "document".
I would suggest we close this then since nobody should be using named getters on new objects anyway.