FA-74019 / Feature flag rollout bucketing / Member archive

Flag value cache freshness: Cached values survive their full ttl second · case 04

A value exactly 30 seconds old is still served from cache.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Process events in order. ["fetch", t, payload] replaces the whole cache with payload, records t and clears kill switches; ["kill", t, flag] forces that flag to its default; ["get", t, flag, default] returns [default, killed] for killed flags, else [default, stale] if nothing was fetched or t - last fetch >= 30 seconds, else [default, missing] if the flag is not cached, else [value, cache]. Return the list of get results.

Why this case matters

Client SDKs serve cached flags offline; kill switches and staleness decide whether a bad flag keeps serving.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
event stream sample 17	`[["dflt", "missing"], [0, "killed"]]`	`[["dflt", "stale"], [0, "killed"]]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.