h3.polyfill fails for simple polygon, works for subpolygon

[ocker11]

polyfill does not return any cells for a polygon but does return cells for a polygon contained within the failing polygon. Both avoid the poles and antimeridian.

Testcase:

print(h3.versions())

x1 = -141.001
x2 = -140.996
y1 = 61.895
y2 = 65.848
y_alt = 64.848

bad = {'type': 'Polygon',
       'coordinates': [[
           [x1, y1],
           [x2, y1],
           [x2, y2],
           [x1, y2],
           [x1, y1]
       ]]
     }

contained_poly = {'type': 'Polygon',
                  'coordinates': [[
                      [x1, y1],
                      [x2, y1],
                      [x2, y_alt],
                      [x1, y_alt],
                      [x1, y1]
                  ]]
                 }

print("Failing poly:", len(h3.polyfill(bad, 9, geo_json_conformant=True)), "cells")
print("Poly contained within failing poly:", len(h3.polyfill(contained_poly, 9, geo_json_conformant=True)), "cells")

Results:

{'c': '3.7.1', 'python': '3.7.6'}
Failing poly: 0 cells
Poly contained within failing poly: 896 cells