Re: [whatwg/dom] Allow for filtering events in "once" handlers (#990)

This might be solvable better with compositional tools for events such as [this proposal](https://github.com/whatwg/dom/issues/544) as yeah it doesn't really extend to multiple events well, but compositional tools (e.g. Observable) extend to many patterns rather than trying to work around these event issues on a case-by-case basis.

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