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Expired export-credit lots reduce current import charges · case 02

Expired export-credit lots reduce current import charges.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Lots [expiry_period, energy] are export credits. At billing period p, keep only expiry>=p, consume oldest-expiring lots first against nonnegative import need, and return [uncovered need, remaining energy by ascending expiry]. Expired lots vanish; zero remainders are omitted.

Why this case matters

Meter settlement depends on explicit register and tariff policies; this controlled model makes that policy observable.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
expired credit	`[0, []]`	`[2, []]`	Failed

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