Re: [whatwg/dom] Unspecified behavior when NodeFilter#acceptNode returns null (Issue #1075)

Essentially creating a PR for https://github.com/web-platform-tests/wpt/tree/master/dom/traversal to cover this behavior. That's the repository we use for tests covering the standard.

Also, all non-number return values seem to be treated as FILTER_SKIP, rather than coerced. That means that `acceptNode()` has to be amended to return `any` instead of `unsigned short`. And it seems that if the value is a number, `Math.floor()` is applied to it.

However, according to https://searchfox.org/mozilla-central/source/dom/webidl/NodeFilter.webidl#32 Firefox does have the "accurate" Web IDL for this. @petervanderbeken are we simply not enforcing that as required (see https://github.com/whatwg/dom/issues/1075#issuecomment-1106410304)? Makes me wonder if there's a larger issue here or maybe I'm just missing something.

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