FA-48058 / Delimited text / Member archive

A second-column delta reads the first-column base · case 03

A structured table violates the declared record or column contract.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Decode two-column semicolon rows. A first row must contain absolute ASCII integer cells prefixed =. Later cells may use signed integer deltas prefixed + or -, or =absolute. A caret copies prior column value. Return numeric rows. Empty tokens and noncanonical nondecimal tokens reject.

Why this case matters

Delimited interchange needs explicit framing, schema and field semantics at ingestion and emission boundaries.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
deltas	`[[10, 20], [13, 8], [12, 17]]`	`[[10, 20], [13, 18], [12, 22]]`	Failed

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