|  | @@ -29,9 +29,9 @@ NS_ASSUME_NONNULL_BEGIN
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				|  |  |    grpc_channel_credentials *_channelCreds;
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				|  |  |  }
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				|  |  |  
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				|  |  | -+ (nullable instancetype)factoryWithPEMRootCertificates:(nullable NSString *)rootCerts
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				|  |  | -                                             privateKey:(nullable NSString *)privateKey
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				|  |  | -                                              certChain:(nullable NSString *)certChain
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				|  |  | ++ (instancetype _Nullable)factoryWithPEMRootCertificates:(NSString * _Nullable)rootCerts
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				|  |  | +                                             privateKey:(NSString * _Nullable)privateKey
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				|  |  | +                                              certChain:(NSString * _Nullable)certChain
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				|  |  |                                                    error:(NSError **)errorPtr {
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				|  |  |    return [[self alloc] initWithPEMRootCerts:rootCerts
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				|  |  |                                   privateKey:privateKey
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				|  | @@ -39,7 +39,7 @@ NS_ASSUME_NONNULL_BEGIN
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				|  |  |                                        error:errorPtr];
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				|  |  |  }
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				|  |  |  
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				|  |  | -- (NSData *)nullTerminatedDataWithString:(NSString *)string {
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				|  |  | +- (NSData * _Nullable)nullTerminatedDataWithString:(NSString * _Nullable)string {
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				|  |  |    // dataUsingEncoding: does not return a null-terminated string.
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				|  |  |    NSData *data = [string dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
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				|  |  |    if (data == nil) {
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				|  | @@ -50,9 +50,9 @@ NS_ASSUME_NONNULL_BEGIN
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				|  |  |    return nullTerminated;
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				|  |  |  }
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				|  |  |  
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				|  |  | -- (nullable instancetype)initWithPEMRootCerts:(nullable NSString *)rootCerts
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				|  |  | -                                   privateKey:(nullable NSString *)privateKey
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				|  |  | -                                    certChain:(nullable NSString *)certChain
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				|  |  | +- (instancetype _Nullable)initWithPEMRootCerts:(NSString * _Nullable)rootCerts
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				|  |  | +                                   privateKey:(NSString * _Nullable)privateKey
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				|  |  | +                                    certChain:(NSString * _Nullable)certChain
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				|  |  |                                          error:(NSError **)errorPtr {
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				|  |  |    static NSData *defaultRootsASCII;
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				|  |  |    static NSError *defaultRootsError;
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				|  | @@ -116,8 +116,8 @@ NS_ASSUME_NONNULL_BEGIN
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				|  |  |    return self;
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				|  |  |  }
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				|  |  |  
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				|  |  | -- (nullable grpc_channel *)createChannelWithHost:(NSString *)host
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				|  |  | -                                     channelArgs:(nullable NSDictionary *)args {
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				|  |  | +- (grpc_channel * _Nullable)createChannelWithHost:(NSString *)host
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				|  |  | +                                      channelArgs:(NSDictionary * _Nullable)args {
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				|  |  |    grpc_channel_args *coreChannelArgs = GRPCBuildChannelArgs([args copy]);
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				|  |  |    grpc_channel *unmanagedChannel =
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				|  |  |        grpc_secure_channel_create(_channelCreds, host.UTF8String, coreChannelArgs, NULL);
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