Problems with promoteId definition in style spec

[samanpwbb]

mapbox-gl-style-spec version: 13.11.0-dev

browser: N/A

---

promoteId appears to be incorrectly applied to source types

The spec states that only source_geojson and source_raster_dem support promoteId.

I believe promoteId should be supported by either source_geojson or source_vector, and not source_raster_dem.

promoteId has an unclear type signature

The spec says, "Either a property name, or an object of the form {<sourceLayer>: <propertyName>}". Can we include an object type definition in the spec similar to how we do for sources (

mapbox-gl-js/src/style-spec/reference/v8.json

Lines 107 to 112 in 51d75fc

	"sources": {
	"*": {
	"type": "source",
	"doc": "Specification of a data source. For vector and raster sources, either TileJSON or a URL to a TileJSON must be provided. For image and video sources, a URL must be provided. For GeoJSON sources, a URL or inline GeoJSON must be provided."
	}
	},

)? Right now there is no type specified, which makes it difficult to generate a UI for setting this property :)

Additionally, it isn't clear to me how to use the string form of this property. Would the string form only be used with geoJSON? Is there a way the spec can make that clear?