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[Lapack] NaN propagation in BLAS

And James Demmel writes:
How to do this of course depends on how we decide to treat the cases
alpha=0, beta=0.

Behavior here is fixed by decades of code depending on current behavior.  I 
know I've used beta=0 to multiply into uninitialized memory.  GEMM documents 
that case specifically.  I have a sneaking suspicion people have used alpha=0 
to scale or initialize C (likely some submatrix of a larger matrix).

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