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SIRS waning-immunity simulation: waning source · case 04

People recovering today already lose immunity in the same step.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Daily forward-Euler SIRS; waning flow is R/immunity_days back to S (immunity_days 0 means permanent immunity); cumulative incidence sums every S->I flow including reinfections; return [S, I, R, cumulative incidence] rounded to 3.

Why this case matters

Compartmental epidemic calculations drive outbreak forecasts, vaccine targets and hospital planning; a single wrong flow, rate conversion or boundary silently changes every downstream number.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: short immunity endemic	`[333.288, 143.595, 323.117, 3630.408]`	`[333.272, 133.331, 333.396, 3385.33]`	Failed

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