Re: [w3c/webcomponents] Events whose composed flag should be true (#513)

Yeah, I think per interface basis might work well here because I could not find any exceptional case.

However, I do not agree the rationale you mentioned :)
For synthetic events, we should always honor the EventInit dictionary.
I meant:
```
let e = new FocusEvent('focus');
console.assert(e.composed, false);

let e = new FocusEvent('focus', { composed: false});
console.assert(e.composed, false);

let e = new FocusEvent('focus', { composed: true}));
console.assert(e.composed, true);  <== true only if it is specified in EventInit dictionaly
```


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