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An ordinary interior operator triggers formula neutralization · case 03

A structured table violates the declared record or column contract.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Encode already textual comma cells for a spreadsheet-facing export. Prefix a single apostrophe if the first non-space/non-tab character is =,+,-, or @. An existing leading apostrophe is preserved without duplication. Then double embedded quotes and quote every cell. Return LF-terminated row. This is a stipulated conservative transport policy, not a universal spreadsheet security guarantee.

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
interior	`"\"\u0027x=1\"\n"`	`"\"x=1\"\n"`	Failed

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