v4.5.0a2

[ajfriend]

[4.5.0a2] - 2026-02-27

• cells_to_h3shape/cells_to_geo now handle all valid cell sets, including sets that would produce global polygons crossing the antimeridian, poles, or are larger than a hemisphere
  • Duplicate cells now raise H3DuplicateInputError
  • Mixed-resolution cells now raise H3ResMismatchError
  • Internal: switch from linked-list to array-based C API for cells-to-polygon conversion

[ajfriend]

One thing to note: the polygon associated with cells0 in these tests (from #482) causes polygonToCells to return different cell counts depending on platform (23 on macOS, 21 on Linux). This could be a useful stress test upstream when revisiting the polygonToCells algorithm in the C library.