FA-59825 / Subscription proration billing / Member archive

Package pricing with milli-unit usage: round-up packaging · case 05

Exact package multiples and zero usage are billed an extra package.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input {events in milli-units, free units, div (units per package), round up|down, price per package}. Units = ceil(sum(events)/1000) once per invoice. Billable = max(0, units - free). Packages = ceil or floor(billable/div) by round. Return [units, packages, packages*price].

Why this case matters

Package pricing rounds usage twice, and doing either rounding at the wrong grain changes the bill.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression 0	`[7, 8, 2000]`	`[7, 7, 1750]`	Failed

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