Add new choroplethmapbox locationmode for geojson `properties.id`

[cpsievert]

It seems like choroplethmapbox traces support MultiPolygons geometry types, but this example fails without error/warning:

https://codepen.io/cpsievert/pen/KKPqgje

Perhaps I am missing something?

[cpsievert]

Interestingly, this same geojson file works as a layout.mapbox.layers -- https://codepen.io/cpsievert/pen/NWKgpzg

[etpinard]

Looks like that geojson

https://gist.githubusercontent.com/cpsievert/66a06baaed96aa47e21ac02fd1d57efb/raw/8ee5ef67ac363910056f0c2aec896381c67a4d64/huh.json

doesn't set any feature id fields. It does set properties.id, but we unfortunately don't support extracting data for properties.id yet. It would be a nice addition to the library though.

[cpsievert]

Ahh, thanks for catching that!

[etpinard]

No problem @cpsievert - ok if I turned this into a type: feature ticket?

[cpsievert]

👍