Since objects aren't addressable by default, there wouldn't be the problems with a bit-packed Boolean collection that C++'s "vector<bool>" has. Does "[Bool]" currently have the option of packed optimization, or would it have to be added via a proposal? Or does it have to be a separate type instead?
This also brings to mind bit fields and fixed-sized bit sets, but those might have to wait for value-based generic parameters, and that's at least until Swift 4....
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