Re: [heycam/webidl] Define that interface objects are constructors (#698)

There was an interesting question about feature detection that was raised the other day: how to detect a change from "no [Constructor]" to "no-arg [Constructor]".  Right now, I think "call the constructor and see if it throws" is the only way in Firefox and Chrome.  The Proxy thing above could be used if we changed whether [[Construct]] happens...

But maybe this is enough of an edge case that it's not an issue.

@rniwa would Safari be open to changing its behavior here, or do you know whom I should be asking about it?

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