Representation of coordinate attributes in GeoJSON

[e-n-f]

What is the name of the object containing the coordinate attributes?

https://github.com/mapbox/geojson-coordinate-properties puts the coordinate properties in a special property, properties.coordinateProperties.

The current Tippecanoe implementation puts them in geometry.attributes.

Is the object flat or structured?

https://github.com/mapbox/geojson-coordinate-properties and Tippecanoe use nested arrays for the coordinate attributes of nested geometry types like MultiLineString

http://github.com/mapbox/vector-tile-base uses a flat structure, as does the vector tile representation