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Disclaimer

So, you have to use copy

Explain

If you have this property:

@property (strong) NSString *name;

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[
  {
    "title": "Phone",
    "subs": [
      {
        "id": 157291,
        "title": "Cell Phone Service"
      },
      {
        "id": 524624,

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import Foundation

open class AsyncOperation: Operation {

    public enum State: String {
        case Ready, Executing, Finished
        
        fileprivate var keyPath: String {
            return "is" + rawValue
        }

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@interface UserModel : NSObject

@property (copy, nonatomic) NSString *name;
@property (copy, nonatomic) NSNumber *age;

@end