Re: [whatwg/dom] Proposal: A Range.prototype.replaceContents(...) (#837)

@emilio if needed, I've just created from scratch [a diffing algorithm that fits in less than 100 LOC](https://github.com/WebReflection/udomdiff/blob/master/esm/index.js) and it could be spec'd too.

The `get` function, in specs case, should instrument the engine to trigger callbacks and mutations when the passed value is `-1`, and ignore these when the passed value is `1` *and* the node was already present in the same `parentNode`.

Values like `0` and `-0` can be ignored so ... anyone interested?

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