testing to verify Cubist can handle nan cells

[pjaselin]

close #138

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.78%. Comparing base (2f69306) to head (3106989).
Report is 2 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
+ Coverage   95.77%   95.78%   +0.01%     
==========================================
  Files          15       15              
  Lines         615      617       +2     
  Branches      152      152              
==========================================
+ Hits          589      591       +2     
  Misses         17       17              
  Partials        9        9              

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