Fix issue when calling _core_groebner_basis_array from Oscar

[wegank]

Closes #138.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.50%. Comparing base (8f34ae6) to head (86436d4).
⚠️ Report is 16 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
- Coverage   83.59%   83.50%   -0.10%     
==========================================
  Files          26       32       +6     
  Lines        2768     3159     +391     
==========================================
+ Hits         2314     2638     +324     
- Misses        454      521      +67     

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[ederc]

Works fine, thanks.

[wegank]

Oh, I was trying to find the draft button in GitHub mobile (probably it just doesn't exist)... I think this might introduce a memory issue which I can't verify for now.

[wegank]

False alarm: this doesn't introduce the memory issue I was worried about.