Curious: why do you use classes instead of structs for implementations in swiftz?
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no reason. I'm probably going to end up switching them to structs where I can.
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developer.apple.com/library/prerel seems to mostly favor classes. Comments? Trying to grok perf of call-by-value.
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In general it's like structs vs. Obj-C classes. Classes mean allocation, potentially dynamic dispatch.