FA-1437 / Concurrency / Member archive

Apply a remote conditional state update: A create-only write replaces an existing object · case 02

The compare and swap operation is admitted even though a create-only write replaces an existing object.

Member previewVariant 2 · 3 implementations · 9 checks per implementation

Case contract

Return a Boolean admission decision for apply a remote conditional state update. The record r must satisfy all of: r['revision_match'][0] == r['revision_match'][1]; r['object_incarnation'][0] == r['object_incarnation'][1]; r['expected_existence'] is False; tuple(r['transition_allowed'][0]) in [tuple(x) for x in r['transition_allowed'][1]]; r['revision_increment'][0] == r['revision_increment'][1]+1. Extra tracing fields are ignored; validation does not mutate the record.

Why this case matters

A deterministic local contract for concurrency. 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
A create-only write replaces an existing object	`true`	`false`	Failed

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