Throw ArgumentError if integer is non-positive

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.64%. Comparing base (fa8840d) to head (d133476).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
+ Coverage   79.90%   82.64%   +2.73%     
==========================================
  Files           3        3              
  Lines         408      409       +1     
==========================================
+ Hits          326      338      +12     
+ Misses         82       71      -11     

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