FA-74189 / Feature flag rollout bucketing / Member archive

Exposure event deduplication: An exposure exactly one window later is suppressed · case 04

Hourly exposure refresh drifts because the event at exactly one window is dropped.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

events are [t, user, flag, variant] processed in timestamp order (stable for ties). An exposure is emitted unless the same (user, flag, variant) was emitted less than window seconds earlier; suppressed events do not move the window. Return emitted indices in processing order.

Why this case matters

Exposure logs define who entered an experiment; duplicates and gaps both bias analysis.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
exactly one window later emits again	`[0]`	`[0, 1]`	Failed

MEMBER ARCHIVE

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