GMSPlacesPriceLevel
enum GMSPlacesPriceLevel : NSInteger {}Describes the price level of a place.
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                  DeclarationSwift case unknown = -1Objective-C kGMSPlacesPriceLevelUnknown = -1
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                  DeclarationSwift case free = 0Objective-C kGMSPlacesPriceLevelFree = 0
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                  DeclarationSwift case cheap = 1Objective-C kGMSPlacesPriceLevelCheap = 1
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                  DeclarationSwift case medium = 2Objective-C kGMSPlacesPriceLevelMedium = 2
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                  DeclarationSwift case high = 3Objective-C kGMSPlacesPriceLevelHigh = 3
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                  DeclarationSwift case expensive = 4Objective-C kGMSPlacesPriceLevelExpensive = 4