Problem

The documentation for geometry-type in the spec (

) could clarify which property types will be available for which source types. Current copy is:

Gets the feature's geometry type: Point, MultiPoint, LineString, MultiLineString, Polygon, MultiPolygon.

Based on a quick experiment, it doesn't appear like the geometry-type expression ever returns a multi* feature when applied to a vector tile source.

Suggestion

There's likely more nuance going on here than I'm aware of – in which case, the appropriate explanation in the appropriate place would solve this issue better than anything I can come up with. Here are some suggestions based on what I know:

• Add a sentence to the spec documentation, something like: "Multi* feature types will only be detectable in GeoJSON sources, use the singular forms when working with vector tile sources".
• Change the behavior of geometry-type to return true for multi-features in both vector tile and GeoJSON source types.