Re: [whatwg/dom] What happens if a 'once' eventListener dispatches a similar event? (#265)

@annevk I see now that the 'removed' flag is indeed useful when calling removeEventListener(). 
However, I do not understand yet why setting the 'removed' flag to true is still useful for 'once' event listeners if we move step 8 between 4 and 5. It seems to me that if we move step 8 between 4 and 5, we could drop the "then set listener’s removed to true" part of step 8.

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