GMSNavigationAlternateRoutesStrategy
enum GMSNavigationAlternateRoutesStrategy : NSInteger {}Indicates the maximum number of alternate routes that can be requested.
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                  All available alternate routes should be shown. DeclarationSwift case all = 0Objective-C GMSNavigationAlternateRoutesStrategyAll = 0
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                  No alternate routes should be shown. DeclarationSwift case none = 1Objective-C GMSNavigationAlternateRoutesStrategyNone
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                  One alternate route should be shown. DeclarationSwift case one = 2Objective-C GMSNavigationAlternateRoutesStrategyOne