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Scheduled rollout ramp: Negative step percentages pass through · case 04

A mistyped -20 percent step reports a negative rollout that downstream gates treat inconsistently.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

steps is a possibly unsorted list of [epoch second, percent or None]. Order steps by time, breaking ties by list position (later entries apply later). Every step with time <= now is active in that order; a None percent is a hold that keeps the previous value; numeric percents are clamped to [0, 100]. Before the first step the percentage is 0. Return [percent, original list index of the last active step or -1].

Why this case matters

Scheduled ramps move production traffic unattended, so the percentage at any instant must be exact.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
negative percent is clamped to zero	`[-20, 1]`	`[0, 1]`	Failed

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