Best way to get to CAS/fetch-and-add on unboxed vectors?

[Ryan Newton]

[@Aleksey] Very good point!  I'd missed that vector does the SOA->AOS
business too.  (I thought that was just Repa & Accelerate.)

In any case, an unboxed vector of tuples can't *actually* support atomic
CAS anyway, so not supporting it is inevitable.
   It does mean that exposeMutableByteArray can't be a method of the Unbox
class.  It would need to be another class capturing the subset of vector
types that are "Atomic" (support concurrent/atomic memory ops).
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