Remember: unpkg.com/topojson@2 is not d3js.org/topojson.v2.js
unpkg.com/topojson@2 is topojson/topojson and converts GeoJSON to topologies.
d3js.org/topojson.v2.js is topojson/topojson-client and knows what to do with topologies.
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forked from Fil‘s block: topojson.topology + topojson.mesh