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The preamble parser includes the equals sign in its delimiter · case 05

A structured table violates the declared record or column contract.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

Read a table with optional exact first line sep=<single nonquote, nonnewline character>. A first-line BOM is removed before recognizing this directive. Without directive use comma. The directive is not data. Later sep= lines are ordinary records. Return delimiter and split records; empty input has no records.

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
custom	`null`	`[";", [["cellcellcellcellcell", "x"]]]`	Failed

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