Re: [whatwg/dom] Removing event listeners through an identifier (#208)

I don't think we should allow any value to be used as the group identifier because that can easily lead to more objects being leaked. I'd suggest that we restrict it to regular strings and symbols which can't leak random other objects. We could allow numbers but not sure if it's worth effort since toString on a number would be just as effective.

In fact, I'd go far as to say I'd object to the proposal which allows any object to be used as a group identifier.

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