Re: [whatwg/dom] MutationObserver opportunity for memory leak. (#482)

The fourth and first approach let me map changes in the SVG tree one-to-one with scene graph changes, without a diffing step. This means determining the changeset has time complexity as big as the changeset itself, whereas dom-diffing of the previous example may have time complexity that increases as the tree size increases even if the changeset stays the same.

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