I guess the fuzziness in my mind is when considering LP64, LLP64, etc. I believe swift attempts to avoid that by defining either 32 bit or 64 bit model. If that is universally the case then I think bitwidth is fine. If not then pointerwidth may be more correct. Those bridging to C would have to consider information from the C world to deal with the variations of type size based on platform and 32/64.
-Shawn
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