Cleanup JuMPExt

[joaquimg]

Part of #36 fixes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.41%. Comparing base (a3d2a5a) to head (edfa632).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #38   +/-   ##
=======================================
  Coverage   98.41%   98.41%           
=======================================
  Files           7        7           
  Lines        1384     1384           
=======================================
  Hits         1362     1362           
  Misses         22       22           

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