Support z in the difference mark #1906
Merged
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I'm putting this in a separate PR because it's a bit of code and I'd like a review. (An alternative would be to say we don't support z, but in that case we'd have to be explicitly removing it; the current situation in which we pass z to the area, but merge the clip-paths &c, is halfway and broken.)
In the example chart, we follow three time series (age cohorts) by country, and by sex (the difference makes the chart switch to grey on the only case where young men are less likely than young women of the same cohort to be living with their parents, top-left (Sweden, Y16-19).
For comparison, I'm adding the faceted version (fy: "age").
TODO: