Detect numbers when sorting

[nwoltman]

Fix https://github.com/javve/list.js/issues/562 by checking if the values being sorted are both numbers and sorting them as numbers if they are.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.60%. Comparing base (d32c85d) to head (5857111). Report is 4 commits behind head on master.

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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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