Is there a way to "chain" NSError instances, similar to how you can chain Throwables in Java using the getCause() method?
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So to answer my own question, it seems that I should use NSUnderlyingErrorKey.
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I really like this feature of NSError's design! And dislike most of the rest... :/ :/
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yeah, with NSError I don't feel like I'm putting the type system to work. But hey, at least the description impl is free...
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