d3.geoPath draws small CCW shapes in the wrong order

[Fil]

See https://beta.observablehq.com/@fil/small-circle-test : for a very small CCW geoCircle(), the resulting map is a small circle, when it should be "the whole earth except the circle".

A (possibly related?) bug is that the centroid of that shape is not at the antipode (where it's supposed to be). The threshold where things go south is not the same for the two bugs.

(My fear is that when we fix this bug, many maps that were ok thanks to that bug will explode.)

All in all, I think what we need here is a tool that will marshall any geojson object into a "reasonably usable" form.

References: #140 #138 (comment)

[Fil]

This is now covered by https://observablehq.com/@fil/rewind