variable color for geo lines?

[Fil]

(Suggested by @mbostock)

either by having a variable color for LineString (seems hard), or an option for Plot.line (or maybe a curve?) that follows spherical line interpolation.

Plot.line(beagle.coordinates, {stroke: (d, i) => i, z: null, strokeWidth: 2})

SOLVED WITH curve: "projected"

[mbostock]

I like the idea of an option to Plot.line that allows spherical interpolation between points.