### polyline.decode(string[, precision]) Takes a string representation of 1+ coordinate pairs and returns an array of lat, lon arrays. If not specified, precision defaults to 5. ### polyline.encode(array[, precision]) Takes an array of lat, lon arrays and returns an encoded string. If not specified, precision defaults to 5. ### polyline.fromGeoJSON(geojson[, precision]) Takes a GeoJSON LineString feature and returns an encoded string. If not specified, precision defaults to 5. ### polyline.toGeoJSON(string[, precision]) Takes an encoded string and returns a GeoJSON LineString geometry. If not specified, precision defaults to 5.