AI-generated Key Takeaways
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          GADAdValuePrecision is an enum defining different levels of precision for an ad value. 
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          Precision levels range from unknown and estimated to publisher-provided and precise values. 
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          GADAdValuePrecisionUnknown indicates an ad value with unknown precision. 
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          GADAdValuePrecisionEstimated represents an ad value estimated from aggregated data. 
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          GADAdValuePrecisionPublisherProvided signifies a publisher-provided ad value like manual CPMs. 
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          GADAdValuePrecisionPrecise denotes the exact value paid for an ad. 
GADAdValuePrecision
NS_ENUM(NSInteger, GADAdValuePrecision) {
  /// An ad value with unknown precision.
  GADAdValuePrecisionUnknown = 0,
  /// An ad value estimated from aggregated data.
  GADAdValuePrecisionEstimated = 1,
  /// A publisher-provided ad value, such as manual CPMs in a mediation group.
  GADAdValuePrecisionPublisherProvided = 2,
  /// The precise value paid for this ad.
  GADAdValuePrecisionPrecise = 3
}Undocumented
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                  An ad value with unknown precision. DeclarationSwift case unknown = 0Objective-C GADAdValuePrecisionUnknown = 0
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                  An ad value estimated from aggregated data. DeclarationSwift case estimated = 1Objective-C GADAdValuePrecisionEstimated = 1
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                  A publisher-provided ad value, such as manual CPMs in a mediation group. DeclarationSwift case publisherProvided = 2Objective-C GADAdValuePrecisionPublisherProvided = 2
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                  The precise value paid for this ad. DeclarationSwift case precise = 3Objective-C GADAdValuePrecisionPrecise = 3