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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

FWIW, you are *by far* the sanest of the value-types-promoters

thanks. i think i do often fail to communicate what i really mean. these concepts are nuanced…

Unfortunately the nuance is lost on... internet commenters at any rate. Everything must be a bistable formalism

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I still haven't expressed well: it doesn't have to be A or B. Best sol'n is often to factor isolated valuey bits from classes.