Multipolygons are breaking geojson convertion

When trying to fetch multipolygons (e.g. 11038555), I get error:

Received corrupt data from Overpass (incomplete polygon).

It seems that happens because outer and inner members are not always closed: they may be just ways.

Are you planning to improve this?

[dericke]

I had a quick look at replacing the built-in geojson method with osm2geojson, found that osm2geojson uses 7 decimal points of precision for coordinates, while this library has been using 6 (default from the geojson library) and osm2geojson nests the id property of a feature under properties, whereas the built-in method puts it in the top level of the feature.

[mvexel]

I think the best way to go about supporting GeoJSON properly is not to roll our own but instead support __geo_interface__. Since geojson implements this interface too, there’s no need to introduce any other dependencies.