Values.LegGeometrySourceContains the geometry details for each path between a pair of positions. Used in plotting a route leg on a map.
type nonrec t = {lineString : LineString.t option;An ordered list of positions used to plot a route on a map. The first position is closest to the start position for the leg, and the last position is the closest to the end position for the leg. For example, [[-123.117, 49.284],[-123.115, 49.285],[-123.115, 49.285]]
*)}