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> In the extreme case, we could make a system where everything is an opaque pointer and there's only one function that just sends things strings containing commands.

Interestingly, Objective-C has other ABI issues…

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what are the issues?

ivar layout: http://www.sealiesoftware.com/blog/archive/2009/01/27/objc_e...

The fragile ivar issue is fixed in the modern Objective-C runtime.

Right, non-fragile ivars shipped with the 64-bit runtime as mentioned in the link.

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