Improve ExceptBy performance

[viceroypenguin]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.58%. Comparing base (a64ecf1) to head (0ce26c1).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #751      +/-   ##
==========================================
- Coverage   95.08%   94.58%   -0.51%     
==========================================
  Files         247      247              
  Lines        8873     8769     -104     
  Branches     1605     1590      -15     
==========================================
- Hits         8437     8294     -143     
- Misses        284      289       +5     
- Partials      152      186      +34     

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