What h3 indexes polyfill() returns?

[alexkokorin2]

I believe that's a strange behavior: https://imgur.com/a/HHz2VGj (purple points are the ones I passed as a polygon, holes = null). Does it return all of the hexagons such that its centroid's inside of the polygon?

[dfellis]

Yes. This way if you pass in a polygon sharing one of the sides, you will not get either of the hexagons that cross through the polygon.

If you want only the hexagons that are exactly within the polygon and no further, you need to create a new polygon exactly 'r' meters inside of the current polygon, where 'r' is the edge length of the hexagon at the resolution you're working in.

For this resolution, you will get zero hexagons that way.