Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

> Should I restore that optimization in issue37319?

Yes, but to fix the bug it needs to occur earlier in the code (currently line 
314):

    if stop is None and step is _ONE: <-- Line 314
                   ^^^^^^^^^^^^^^^^^  <-- Add this   

And again later:
         if istep == 1 and width > 0:   <-- Line 348
                     ^-- change to _ONE

As a standalone optimization, it wasn't worth it, but as a way to fix the bug 
without a regression, it is reasonable.

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<https://bugs.python.org/issue42772>
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