simonpoole left a comment (openstreetmap/openstreetmap-website#6713)
> To elaborate, iD uses
> [country-coder](https://github.com/rapideditor/country-coder/), which stores
> simplified country boundaries in a
> [which-polygon](https://github.com/mapbox/which-polygon/) spatial index,
> which in turn is based on [RBush](https://github.com/mourner/rbush/), which
> is an R-tree implementation, like PostGIS.
I wasn't implying that iD implementation was the best in class (it's the
worst), just that it isn't a novel idea even for OSM central infrastructure.
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