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The NSKeyedUnarchiver methods
can commonly throw Objective-C exceptions that we can't handle on the main thread (eg when the unarchiver encounters unexpected data).
These are cases where it's common to wrap in a @try/@catch in Objective-C. Is this something MT can handle, per http://stackoverflow.com/a/10549490?
Technically I believe it's possible, but we haven't looked into the details yet (I have vague plans to look into this some day, but there is nothing definite yet).
This has been fixed by doing custom marshalling of the exceptions for this particular class (NSKeyedUnarchiver).
The next release with this fix will be 6.0.6