stopover property
Influence routes with stopover and pass through points
For each waypoint in the request, the directions response
appends an entry to the legs array to provide the details
for stopovers on that leg of the journey.
If you'd like to influence the route using waypoints without
adding a stopover, prefix via: will be added to the waypoint.
Waypoints prefixed with via: will not add an entry to the
legs array, but will route the journey through the waypoint.
Implementation
final bool stopover;