FA-73890 / Feature flag rollout bucketing / Member archive

Weighted variant allocation: Fractional weights are truncated to basis points · case 05

A 0.29 percent arm covers only 28 buckets and 33.33 percent splits leak buckets.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

variants is an ordered list of [name, weight percent with at most two decimals]; bucket is an integer in [0, 10000). Walk variants in declared order, skipping non-positive weights, adding round(weight * 100) to a running total, and return the first variant whose total exceeds the bucket. Buckets beyond the total go to the last positively weighted variant; with none, None.

Why this case matters

Variant splits decide which arm of a flag a user receives and must honour declared weights exactly.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fractional weight 0.29 covers 29 buckets	`"rest"`	`"tiny"`	Failed

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