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Header canonicalization happens after binding · case 02

A structured table violates the declared record or column contract.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Bind a comma-split header and data row. Header keys are ASCII case insensitive and stripped. Reject empty or duplicate canonical names, reserved _extra, and unequal width. Preserve data cell whitespace.

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
canonical names	`{"A": "cellcell", "B": " y "}`	`{"a": "cellcell", "b": " y "}`	Failed

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