Unroll based off of sizeof(eltype(C)) #60
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For huge duals, we probably don't want to unroll much at all.
For small duals, unrolling more helps.
The intention is to try and keep up with
SMatrixperformance, but while this does well in microbenchmarks, in practice it is still several times slower in the real workload, with 80% GC time vs 15% GC time for the SMatrix version. =/