perf: default integer arrays to int32 for ~25% memory reduction#566

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FBumann wants to merge 9 commits intoPyPSA:masterfrom

FBumann:perf/int32

Commits on Feb 1, 2026

Commits on Feb 2, 2026

- linopy/variables.py: ffill, bfill, sanitize — labels were cast back to int64 via astype(int), now use DEFAULT_LABEL_DTYPE. Also Variables.to_dataframe arange for
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Add dtype tests
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