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docs(D-CMR): Experiment A's i32 arm is a counterexample, not today's fold #1541

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AdaWorldAPI merged 1 commit into from
Oct 13, 2026
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docs(D-CMR): Experiment A's i32 arm is a counterexample, not today's fold #1541

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6 changes: 4 additions & 2 deletions .claude/plans/d-cmr-concept-chain-normalization-v1.md
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Expand Up @@ -229,8 +229,10 @@ update and maintenance laws), never a precondition for `SUM`.
## 7. Experiments, each with an independent oracle and a negative control

- **A. Cancellation.** At the aggregate level: `Sum(A) − Sum(A∧B)` against
`Sum(A∧¬B)` and an exact `i128` oracle; an eager variant accumulating into
`i32` shows the loss. Under checked arithmetic the rewrite must refuse.
`Sum(A∧¬B)` and an exact `i128` oracle. An eager variant that deliberately
accumulates into `i32` is the counterexample that shows the loss; it is not
a model of today's fold, which accumulates exactly into `i64` within the row
bound. Under checked arithmetic the rewrite must refuse.
- **B. Range intersection.** k compatible ranges intersect before any row is
read. Baseline: `fold_ranges` and `Lowering::Range` (tests at quack
`lib.rs:5204–5248`).
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