[SciPy-Dev] Code review for trapz update

[K. N.]

I've proposed a change to trapz, so that bin widths (`x` array deltas) are
always considered positive.  This allows monotonically decreasing `x`
sequences to be used, in addition to monotonically increasing sequences.

I am open to the idea of accepting non-monotonic sequences as well, and
performing a sort on `y` to make `x` monotonic, regardless of its input
form, but I think this may make the code more complex than necessary.

Thoughts and suggestions are welcome.

https://github.com/fizyxnrd/numpy/compare/master...trapz_binwidth_fix
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