It would be nice to be able to pass in an optional parameter like &coordinates=1 and have the latitude and longitude points of each result returned in a new variable. For example, a state (or block group, tract, etc) would have a coordinate field with the array of lat/lon points of the state outline.
Yes it would be a larger amount of data being returned, but it's optional. To save size, the coordinates could be encoded and save 3-5 times the data, like here: https://developers.google.com/maps/documentation/utilities/polylinealgorithm
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