Hi,

Riccardo Mottola wrote:
    if ([cs isKindOfClass:[NSCharacterSet class]])
      NSLog(@"is NSCharacterSet");
    if ([cs isKindOfClass:[NSMutableCharacterSet class]])
      NSLog(@"is NSMutableCharacterSet");

if this is a safe test - and it ought to be - then it passes also on venerable 10.4. So actually it is there that the Xcode doc. lies, since it returns a NSMutableCharacterSet.

Now, I had a look at our code and the issue was just the interface, the code was there - this is why the program did not actually crash. I opened PR 521 in that regard and for discussions, since there are other methods that may be affected, although their implementation is done through mutableCopy

Riccardo

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