Treat NaN as absent in v1 arithmetic#627

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FBumann wants to merge 6 commits into

harmonize-linopy-operations-mixedfrom

Commits on Mar 18, 2026

Treat NaN as absent in v1 arithmetic instead of raising ValueError

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Fix Variable * NaN inconsistency, restore constraint RHS NaN raise

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Show .sel() masking approach in missing-data notebook demo

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Add mask= approach alongside .sel() in constraint NaN demo

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Split constraint NaN demo into separate cells

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Require fill_value when alignment introduces NaN in mul/div

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