Implement construction from negative strides#901

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SparrowLii wants to merge 2 commits intorust-ndarray:masterfrom SparrowLii:neg_strides

+157-14

Commits on Jan 27, 2021

Fix constructors when strides are negative
SparrowLii
committed

Commits on Jan 28, 2021

implement constructors from negative strides
SparrowLii
committed