One would think that given the Objective-C 2.0 runtime (which is only available on iPhone OS, or 64-bit mode in Mac OS, ARGH!) and its support for iVar layouts, adding an ivar to an existing class would be possible. Since it isn't [...]
I thought that was one of the features of the Objective-C 2.0 runtime, is a non-fragile base class. Enabled by runtime computed instance variable offsets - which is why direct instance variable access is highly discouraged in any Objective-C 2.0 code.
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