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Minimum threshold for invoicing prorations: carried amount inclusion · case 03

Small deferred prorations from earlier cycles are never billed.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Input {lines, threshold, carried}. Pending = carried + sum(lines). Pending >= threshold is invoiced now; pending <= -threshold is credited to the balance now; anything in between is carried to the next cycle. Return [invoiced, credited, carry].

Why this case matters

Tiny proration amounts are deferred to avoid micro-charges, but must not be lost.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression 0	`[0, 280, 0]`	`[0, 286, 0]`	Failed

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