Re: [whatwg/dom] Simple EventListenerOptions feature detection (#491)

Oh and as I understand it, @cramforce's performance concern is that in large systems you really don't want each independent module creating GC pressure by allocating memory during initialization just for feature detection.  Maybe returning a new dictionary is a bad thing by that metric?

I guess I'd rather not introduce another one-off pattern if the rough pattern used by `getSupportedConstraints` isn't good enough.  But maybe as the interim solution it's fine. Presumably some day we'll have a generic solution in WebIDL and use of these ad-hoc feature detection APIs can be discouraged.


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