Fix check_values when num_points>3

[cantrellb]

Fixes issue #51

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.65%. Comparing base (fe5043f) to head (0fc0355).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
+ Coverage   99.59%   99.65%   +0.06%     
==========================================
  Files           9        9              
  Lines        1470     1470              
==========================================
+ Hits         1464     1465       +1     
+ Misses          6        5       -1     

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[Stoops-ML]

Requires formatting with ruff

[Stoops-ML]

Also, please add a test checking the code changes against different number of points

[Stoops-ML]

Brilliant! Thank you for improving the repo!