FA-73913 / Feature flag rollout bucketing / Member archive

Flag targeting precedence: Prefix clauses ignore letter case · case 03

A rule for emails starting with "ann" also captures "Ann@..." addresses.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

An off flag serves its off variation (reason OFF). Otherwise individual targets (checked by sorted variation name) win with reason TARGET, then rules in order, then the fallthrough. A rule matches only when the user has its attribute: op in = membership, startsWith = case-sensitive string prefix, lt = numeric less-than any value; negate inverts a present attribute result. Return [variation, reason, zero-based rule index or -1].

Why this case matters

Evaluation order decides whether QA allowlists, segment rules and defaults behave predictably.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
prefix match is case sensitive	`["v1", "RULE", 0]`	`["v0", "FALLTHROUGH", -1]`	Failed

MEMBER ARCHIVE

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