Detect numbers when sorting

[nwoltman]

Fix #562 by checking if the values being sorted are both numbers and sorting them as numbers if they are.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.60%. Comparing base (d32c85d) to head (5857111).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #779      +/-   ##
==========================================
+ Coverage   93.54%   93.60%   +0.05%     
==========================================
  Files          19       19              
  Lines         837      844       +7     
  Branches      199      201       +2     
==========================================
+ Hits          783      790       +7     
  Misses         38       38              
  Partials       16       16              

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