As of August 2016 GeoJSON is now a formal IETF specification. And some things have changed from the old informal 2008 spec. So to be valid for the 2016 spec polygons MUST be right-hand wound.
In shapes_simplified_low the geojson fails to meet the above rule and does not validate in most linters e.g http://geojsonlint.com/
Are there any plans to update this file so that all the geojson meets the IETF spec?