Commits on Dec 14, 2020

1. Fix Zip::indexed for the 0-dimensional case …

   This commit fixes a panic for 0-dimensional, indexed `Zip` instances
   which results from an out-of-bounds index in a call to
   `IndexPtr::stride_offset` in `Zip::inner`. Basically, the "stride" for
   `IndexPtr` is the axis to update, but for the 0-dimensional case,
   there are no axes, so `IndexPtr::stride_offset` cannot be called
   without panicking due to the `self.index[stride]` access.
   
   The chosen solution is to add a special check to `Zip::apply_core` for
   the 0-dimensional case. Another possible solution would be to modify
   the loop of `Zip::inner` such that an offset would not be performed
   for an index of zero.

   

   jturner314 committed Dec 14, 2020
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