Tyson Andre e7ff590d0d Optimize array_slice for packed arrays with large offsets ...

If the offset is 100000, and there are no gaps in the packed/unpacked array,
then advance the pointer once by 100000,
instead of looping and skipping 100000 times.

Add a new test of array_slice handling unset offsets.

Closes GH-4860.

2019-10-28 11:30:59 +01:00

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