Release v4.5.0

[4.5.0] - 2026-05-21

Added

• cellsToMultiPolygon function (#1104, #1113)
  • Internal for now, will be added to the public API in a future release
  • destroyGeoMultiPolygon function (#1104)
  • (internal) geoLoopArea function (#1101)
• reverseDirectedEdge function (#1098)
• Bidirectional gridPathCells (#1111)
• h3.pc pkg-config file (#1115)

Changed

• cellsToLinkedMultiPolygon now uses cellsToMultiPolygon internally (#1126, #1133, #1136)
  • cellsToLinkedMultiPolygon (and cellsToMultiPolygon) now return errors for invalid cells (E_CELL_INVALID), mixed resolutions (E_RES_MISMATCH), and duplicate cells (E_DOMAIN) instead of producing undefined output
• cellAreaRads2 uses geoLoopArea (#1101)
• Refactor of indexing code to use Vec3d (#1145, #1155)
• Refactor of CoordIJK code to be inlineable (#1154)

Fixed

• CLI handling of invalid cell input (#1125, #1124)
• destroyLinkedMultiPolygon is now idempotent (safe to call twice) (#1136)