FA-47465 / Delimited text / Member archive

Ordinary null-aware cells are normalized destructively · case 05

A structured table violates the declared record or column contract.

Member previewVariant 5 · 3 implementations · 10 checks per implementation

Case contract

Read already lexed cells represented as [text, was_quoted]. Only unquoted NULL is null. An unquoted empty cell is absent, encoded as {missing:True}; quoted empties are empty strings. Unquoted !DEFAULT expands to supplied default. Ordinary whitespace is significant.

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
spaces	`["NULL", ""]`	`[" NULL ", " "]`	Failed

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