FA-60250 / Inventory cost layering / Member archive

Layer aging and slow-moving reserve: overflow bucket · case 05

Stock older than the last bound is merged into the last bucket and reserved at its lower rate.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Input {layers:[[receipt_day,qty,unit]], today, buckets:[upper age bounds, inclusive], reserve_bp:[rate per bucket incl. overflow]}. Age = today - receipt_day; layers with negative age are in transit and excluded. A layer falls in the first bucket whose bound is >= age, else the overflow bucket. Reserve = sum over buckets of round-half-up(value*bp/10000). Return {values, reserve}.

Why this case matters

Inventory valuation and cost-of-goods decisions depend on this rule.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
mixed ages	`{"reserve": 32, "values": [110, 0, 126, 0]}`	`{"reserve": 37, "values": [110, 0, 105, 21]}`	Failed

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