Will Davis

- [x] I agree to follow the project's [code of conduct](https://github.com/georust/geo/blob/main/CODE_OF_CONDUCT.md). - [x] I added an entry to `CHANGES.md` if knowledge of this change could be valuable to users. ---...

Currently when getting the coordinate position for some triangle boundary coords, a different `CoordPos` is returned when using a `Triangle` vs the same triangle as a `Polygon`. The `Polygon` implementation...

A case where not all points are contained within the concave hull. This issue also occurs when using the [C++ port](https://github.com/sadaszewski/concaveman-cpp) though not necessarily with the given examples. #### A...