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Lots of good advice + analysis here

! FWIW, I’m more interested in single-owner than immutability! :)

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structs vs classes: faq.sealedabstract.com/structs_or_cla

have you looked at the new gnu objective-c features for this?

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Not sure what you're referring to!

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iirc there was a talk describing a means to have owner objects intercept msgs sent to children

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this is a feature I've always wanted for actors - allow refs but always route through owner actor queue