Stringer map type. We now know that the date property exists on the map. 
Stringer map type. We now know that the date property exists on the map. 
vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,vega/vega-lite,vega/vega-lite,uwdata/vega-lite