valarray slice stride now takes size_t rather than int?
That limits it's usefulness as a BLAS-like slice, since BLAS increment =
paramters not only take negative numbers, it's a frequently used =
feature. Negative increments means that the stride ranges from the end =
of the vector back to the beginning.  This makes it easy to a =
convolution, for example, using the same routine as a dot product, only =
using a negative increment instead of a positive.=20

Is there a reason this was changed that I'm missing?

           -SMD
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