FA-65658 / Ecological population dynamics / Member archive

Insect degree-day accumulation with horizontal cutoff: negative day floor · case 03

Cool days reduce the cumulative total.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Daily max is capped at upper; daily min is raised to base and capped at upper; DD = max(0, mean - base); emergence day is the first 1-based day with cumulative DD >= target; return [cumulative rounded 2, day or None]; None when upper <= base.

Why this case matters

Population projections set harvest quotas, conservation status and pest-control timing; a wrong update order, boundary or rate conversion silently changes management advice.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: cold days below base	`[[-2.5, -3.5, -4.0], null]`	`[[0.0, 0.0, 0.0], null]`	Failed

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