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* Raise a descriptive error if non-positive integer passed to in_groups_of.Xavier Shay2014-07-301-0/+6
| | | | | | | | | | This is more consistent than the current behaviour of raising a `ZeroDivisionError: divided by 0` error when 0 is given, which can be non-obvious especially if `in_groups_of` is part of a longer chain of methods. The negative case was ok - "ArgumentError: invalid slice size" - but this error is clearer still.
* Move array test files under arrayAkshay Vishnoi2014-07-291-0/+120