[4.0.0-rc1] - 2022-02-07

Breaking changes

• Rename functions according to the terminology RFC (#571, #403, #466, #495, #466)
• Functions that can experience errors now have an H3Error return value. (#551, #550, #509, #505, #507, #508, #503, #478, #468, #436, #359)
• Cell count parameters use int64_t instead of int.
• polygonToCells (previously polyfill) accepts a flags argument for future expansion. (#570)

Added

• Vertex mode and associated functions: (#422, #420, #417)
  • cellToVertex(cell, vertexNum)
  • cellToVertexes(cell, out)
  • vertexToLatLng(vertex, out)
  • isValidVertex(vertex)
• h3 CLI application. (#556, #497)

Fixed

• A number of issues detected via unit tests and fuzzers were fixed. (#568, #562, #558, #559, #560, #430)

Other changes

• Generally use lng instead of lon
• Closed-form implementation of numHexagons
• A number of fuzzer harnesses are now included in the H3 core library. (#557, #553, #545, #433)
• Additional benchmarks are added and benchmarks are regularly run in CI. (#524, #518)