Re: [heycam/webidl] Use OrdinarySet instead of [[Set]] (#201)

> Our [[Set]] sets an internal slot on the platform object 

It's complicated, because you can get lots of calls to [[GetOwnProperty]] under the [[Set]] call (and in fact can run arbitrary amounts of script under there), but we only want to affect the one specific [[GetOwnProperty]] that looks up that one property at the beginning of OrdinarySet.

We could set the flag in our [[Set]] and then have the very first [[GetOwnProperty]] call unset the flag before carrying on.  But now we're making assumptions about the internals of the default [[Set]] or OrdinarySet and what internal methods it invokes in which order...

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