Re: [whatwg/dom] Range#expand() (#431)

@annevk : well, the fundamental problem here is that we use ICU for all other word breaking purposes except editing & selection. I was using the term "ICU" was a way to refer to the word boundary definition for `Intl.Segmenter`. To put it another way, the word boundary behavior for selection can't be same as the one used for line breaking and `Intl.Segmenter` etc...

I don't think Web authors want our word boundary behavior for selection to be the word boundary behavior of `Intl.Segmenter` either. For starters, they have specific quirks that are only desirable and useful in the context of selecting a word. And it's going to be extremely slow.

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