Re: [csswg-drafts] [css-color-4] Do gradients/animations using lab/lch colors interpolate in the Lab colorspace? (#4647)

@faceless2 I'm seeing some hard-to-explain-to-others behaviour in your example. Take this pair of colours for example:

```
var lch0 = [50, 120, 0];
var lch1 = [50, 40, 180];
```

I might reasonably expect a perceptually uniform gradient, but it is all bunched up because it is trying to avoid the discontinuity at C=0.

![odd](https://user-images.githubusercontent.com/2506926/81100803-281a0f80-8edb-11ea-87ea-aa9e8e1a92dc.png)


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