Re: [whatwg/dom] toggleEventListener (#251)

I don't know of any analogy in a library. This API would need all of the arguments that `addEventListener` needs since it's potentially calling both add and remove. The analogy to `classList` isn't good because 1) that case is just toggling a simple string, there is no other associated state, and 2) unlike `classList.contains()`, there is no method exposed to determine whether any event listener is currently attached at all, much less attached with a specific handler and set of event options.


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