Geocoding that never phones home

Open the demo, open your browser's network tab, and type an address. You'll watch it resolve to a rooftop coordinate — 1600 Pennsylvania Ave lands on the actual building, within about ten metres — and then you'll notice what's missing from the network tab: a request carrying your address. There isn't one. The parser ran in the page. The gazetteer it resolved against is a file on a CDN that the…