Re: [whatwg/dom] Improving ergonomics of events with Observable (#544)

@annevk concerns about the ability to call preventDefault() when using Promise returning methods are valid. Mutation use cases could be addressed with a ~do~ method which allows side effects to be interleaved.

~~~js
button.on(“click”).do(e => e.preventDefault()).first()
~~~

This method is included in most userland Observable implementations.


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