GeoJSON polygons with holes

[mramato]

I'm working on adding polygons with holes support to the DataSource layer so that GeoJSON, CZML, KML, and others can use it. As a test case, I created this simple geojson file click to view. Hit raw for the text.

Either I'm misunderstanding something or this behavior seems to be incompatible with how we define holes in Cesium. I created this Sandcastle example that uses the same data to try and reproduce the visual, but it's not what I expect. (The geometry is in Sumatra). I'm not sure if this is a bug in our geometry computation or something I'm doing wrong.

Any suggestions? I think the GeoJSON spec does a poor job of defining what is supposed to happen with data like this, but I think it's important we be able to render GeoJSON files the same as Leaflet does; since that's pretty much become the defacto GeoJSON viewer.

Leaflet:

Cesium:

[mramato]

Fixed with #2353, the spec seems to indicate holes like the above are not valid and just a fluke of the leaflet implementation.