GMSMutableFeatureStyle
@interface GMSMutableFeatureStyle : GMSFeatureStyleMutable version of GMSFeatureStyle.
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                  DeclarationSwift @NSCopying var fillColor: UIColor? { get set }Objective-C @property(nonatomic, readwrite, copy, nullable) UIColor *fillColor
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                  DeclarationSwift @NSCopying var strokeColor: UIColor? { get set }Objective-C @property(nonatomic, readwrite, copy, nullable) UIColor *strokeColor
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                  DeclarationSwift var strokeWidth: CGFloat { get set }Objective-C @property(nonatomic, readwrite) CGFloat strokeWidth
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                  DeclarationSwift var pointRadius: CGFloat { get set }Objective-C @property(nonatomic, readwrite) CGFloat pointRadius
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                  Creates a new mutable style. DeclarationObjective-C + (nonnull instancetype)style;