FA-73955 / Feature flag rollout bucketing / Member archive

Segment membership precedence: Absent attributes match null clause values · case 05

Users without a tier attribute join a segment whose clause lists null among its values.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

A user is in the segment if its key is in included (reason included, which beats excluded); else not if its key is in excluded; else if some rule with a non-empty clause list has every clause matching (reason rule:i). A clause [attr, values] matches only when the attribute is present and its value (or any element of a list value) is in values. Otherwise [False, none].

Why this case matters

Segments are reused across many flags, so a precedence slip changes exposure everywhere at once.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
segment sample 31	`[true, "rule:0"]`	`[false, "none"]`	Failed

MEMBER ARCHIVE

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