FA-7215 / Transport flow control / Member archive

Acknowledged byte count excludes already acknowledged prefix · case 05

Acknowledged byte count excludes already acknowledged prefix.

Member previewVariant 5 · 3 implementations · 4 checks per implementation

Case contract

Given ack, previous, sent, acknowledged byte count excludes already acknowledged prefix. Return the protocol decision or transformed value; fields are validated and fixtures state boundary outcomes.

Why this case matters

This deterministic transport flow control model isolates the acknowledged-byte-count-excludes-already-acknowledged-prefix policy at a network component boundary.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fixture 2	`7`	`0`	Failed

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