RouteAlternativesRequestCallback   
    Interface definition for a callback that is notified whenever alternatives routes are refreshed on demand.
Functions
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                abstract fun onRouteAlternativeRequestFinished(    routeProgress: RouteProgress,     alternatives: List<DirectionsRoute>,     routerOrigin: RouterOrigin)
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Invoked when on-demand alternative routes request finishes.
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                Invoked when the request fails or is canceled.