FA-68775 / Toll and parking fee computation / Member archive

Demand-responsive meter rate adjustment: unchanged rates are not clamped · case 05

Demand-responsive meter rate adjustment returns a wrong result when unchanged rates are not clamped.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input {rate, occupancy: hourly percentages, hi, lo, step, min_rate, max_rate, min_samples}. With fewer than min_samples samples the rate is unchanged. Otherwise the exact mean occupancy above hi raises the rate by step, below lo lowers it by step; the result is always clamped to [min_rate, max_rate].

Why this case matters

Fee engines bill customers in integer cents; a wrong boundary, rounding stage or cap scope silently over- or under-charges.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fee oracle 4	`0`	`100`	Failed

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