Re: [csswg-drafts] [css-color-5] Undefined Hue angle when interpolating from neutrals (#4928)

I've made an [interactive notebook](https://observablehq.com/@danburzo/chroma-premultiplication) to try it out. It works surprisingly well! It handles graciously and continuously zero, and near-zero, chroma:

<img width="893" alt="Screenshot 2020-07-14 at 15 02 12" src="https://user-images.githubusercontent.com/205375/87423521-1fcd0780-c5e3-11ea-86bc-8be9dc86b122.png">

But it's arguably not the "correct" interpolation with noticeably large chroma:

<img width="911" alt="Screenshot 2020-07-14 at 15 02 44" src="https://user-images.githubusercontent.com/205375/87423533-265b7f00-c5e3-11ea-9774-cf7aadaf4238.png">


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