uber / h3 / 21917606756

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cellsToMultiPolygon core algorithm (#1113)

* cellsToMultiPolygon squashed commit

* hash multiplier fix

* that'll never be a problem

* H3_EXPORT(getPentagons)

* relax tolerance a bit

* can we tighten?

* move createGlobeMultiPolygon

* remove awkward tests. same coverage, due to testCellsToMultiPoly.c

* cmp_uint64

* never say never again

* claude takes a pass

* handle all memory on error, and 100% line and branch coverage on changes

* lint

* fix build

* overflow check

* tentative function signature

* more comments

* typos

* destroySortableLoopSetShallow

* Use SIZE_MAX instead of INT64_MAX

* cancelArcPairs returns H3Error

* back to 100% coverage (destroySortableLoopSetShallow)

* flatten cancelArcPairs with early returns

* use int64_t for index variables instead of int

* a few more

* improve a comment

* drop justfile

* equality check instead of assignment

* add .cache to .gitignore

* NEVER(err) on directedEdgeToBoundary

* slightly more robust validateCellSet avoids reading cells[0] when numCells == 0

* two separate functions is OK

1888 of 1921 branches covered (98.28%)

Branch coverage included in aggregate %.

350 of 350 new or added lines in 2 files covered. (100.0%)

3331 of 3350 relevant lines covered (99.43%)

32232644.23 hits per line