Re: [w3ctag/design-reviews] Temporal proposal (#311)

Re: time-delta

This is actually a fair bit more complicated than that. For one thing, the delta depends on TimeZones which may not be available.

So the approach we have chosen for *temporal* is to be explicit. So for `Instant` you'd do

```
if (instant1.milliseconds - instant2.milliseconds > instant3.milliseconds - instant4.milliseconds) {
  // do something
}
```

If you assume `CivilDate` then `date1 - date2` will never give you a result that can in any way be relied upon to be correct. So being more explicit ensures that the result will actually be what you'd expect.

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