IDL (antimeridian) undercounting

[sebsebmc]

At the IDL the polygon passed to H3's polyfill will return no results. This is a documented issue with H3 here: uber/h3#210

In order to fix this, when H3 returns 0 cells, its most likely because the polygon crosses the antimeridian and so the polygon needs to be split into 2 polygons with the antimeridian as the edge between the two.