Re: [whatwg/dom] Adding a `context` property to the listener options. (#472)

I support this. Not *instead of* groups (as it doesn't solve most use cases of groups), but in addition to them, to avoid having to invent pointless groups just to unbind callbacks from multiple elements.

It may be helpful to provide an example where this is not merely a performance improvement over arrow functions though, but also leads to more maintainable code. Performance is often a weak reason to standardize around because it changes so much over the years.

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