FA-359 / Consensus / Member archive

Activate a joint voting configuration: The new configuration has only a minority · case 04

The joint configuration operation is admitted even though the new configuration has only a minority.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Return a Boolean admission decision for activate a joint voting configuration. The record r must satisfy all of: len(set(r['old_majority'][0]) & set(r['old_majority'][1])) * 2 > len(set(r['old_majority'][0])); len(set(r['new_majority'][0]) & set(r['new_majority'][1])) * 2 > len(set(r['new_majority'][0])); r['configuration_entry'][0] <= r['configuration_entry'][1]; r['no_pending_change'] is None; all(x >= r['learner_catchup'][0] for x in r['learner_catchup'][1]). Extra tracing fields are ignored; validation does not mutate the record.

Why this case matters

A deterministic local contract for consensus. Each negative fixture violates exactly one invariant. No transport timing, persistence, cryptographic verification, or full protocol implementation is claimed.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
The new configuration has only a minority	`true`	`false`	Failed

MEMBER ARCHIVE

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