Re: [heycam/webidl] Need pattern for feature detecting dictionary members (#107)

I like it!

In your `"imageOrientation","none"` example that's explicitly testing both that the dictionary member exists, and that the value is a valid member of the enum?  Does `supports` also handle just checking enum members without any dictionary at all?

Would passing a dictionary possibly work better than strings?  Eg. 
```javascript
  createImageBitmap.supports({imageOrientation: "none"})
```
Then in some cases you may just use the same dictionary (or a subset of it) that you'd end up passing to the actual call.


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