Re: [whatwg/dom] Change DOMTokenList's replace() to return boolean (#582)

Thanks for the feedback. I've restored "then".

> This makes it return true when you replace an existing item with the same item.

I did consider this, but couldn't see a compelling scenario where another behaviour would be preferable. I'd like to hear in case someone does, though.

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Should I create a pull request in the WPT repository for the updated tests at this stage, or wait for further feedback / implementer interest?

I'd also be interested in submitting patches for this change to the major browser engines (assuming I can get them to compile), though I'll wait until this has been merged into the spec first.

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