geoStitch mislabels the union of two Polygons forming a hole on the date line as a MultiPolygon #216
Description
@Fil and I identified an issue with d3.geoStitch.
Not sure how close it is related to #108.
The use case is based on two regular polygons forming a hole when they join on the date line. The coordinates of the result are correct, in the correct winding order, but the shape is incorrectly tagged as a MultiPolygon and the inner polygon being marked as an outer polygon covers the whole sphere.
A------B B-----C
| | | |
| E--D | |
| | | |
| F--G | |
| | | |
K------J J-----H
Full details on https://observablehq.com/@fil/geostitch-bug-nzzo