feat(v1): drop first-class MultiIndex — feasibility + implementation (#744)#803

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FBumann merged 35 commits into

feat/arithmetic-conventionfrom

feat/v1-no-multiindex

Jul 13, 2026

Commits on Jul 1, 2026

test: MultiIndex -> flat+aux feasibility checks (#744)

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docs(arithmetics): MultiIndex -> flat+aux feasibility matrix (#744)

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test(mi): storage-SOC LP-file equivalence; refine matrix (#744)

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test(mi): cover non-cyclic SOC boundary (ramps too) (#744)

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test(mi): separate ramp (row-drop) from non-cyclic SOC (where) (#744)

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test(mi): rename to test_period_boundary_lp_identical; show 3 boundaries (#744)

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docs(arithmetics): stochastic is N-D, not a second MI (#744)

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docs(arithmetics): tag boundary / non-linopy-MI rows with ⊥ (#744)

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docs(arithmetics): lead with the MI-scope premise; add reset_index root cause (#744)

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docs(arithmetics): state the snapshot-only MI scope plainly (#744)

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docs(arithmetics): output is in-linopy MI (snapshot out), not ⊥ boundary (#744)

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test(mi): pin snapshots-param flat rebuild; matrix 🔵→🟢 (#744)

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docs(arithmetics): sink the ⊥ boundary rows to the bottom (#744)

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docs(arithmetics): split PyPSA-side MI usages into their own table (#744)

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docs(arithmetics): BLUF-first rewrite; fix glyph overload; condense (#744)

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docs(arithmetics): correct "zero changes" → net subtraction; add strip analysis (#744)

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docs(arithmetics): frame the verdict as four wins, not just code-strip (#744)

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docs(arithmetics): frame the mental-model win as linopy's own (#744)

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docs(arithmetics): rewrite Verdict in the maintainer's voice (#744)

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docs(arithmetics): attribute cases to PyPSA; state the generalization assumption (#744)

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docs(arithmetics): dense rewrite — Decision + Appendix shape (#744)

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docs(arithmetics): fix "MI-indexed results back" — linopy returns flat (#744)

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docs(arithmetics): resolve "no change" vs "input sugar" contradiction (#744)

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docs(arithmetics): consolidate into a Design decisions table (#744)

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docs(arithmetics): MI surface is bigger — two-layer payoff + corrected sweep (#744)

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docs(arithmetics): add latent-risk and MI-not-promoted arguments (#744)

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docs(arithmetics): add the second MI surface — multi-key groupby (#744)

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docs(arithmetics): fold multi-key groupby into the matrix as the 🔲 row (#744)

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feat(v1): multi-key groupby returns a flat group dim under v1 (#744)

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test: make the MI `u` fixture semantics-aware for the v1 MI drop (#744)

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feat(v1): disallow MultiIndex dim-coords entirely (#744)

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feat(v1): guard add_objective against MultiIndex; hoist imports (#744)

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docs(arithmetics): track open-items.md; mark #744 resolved (#744)

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Commits on Jul 13, 2026