FA-48232 / Delimited text / Member archive

An empty append operation writes a header or terminator · case 02

A structured table violates the declared record or column contract.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Append comma rows to existing serialized text. Existing text is either empty or ends in a complete physical record, optionally lacking its final LF. On an empty file emit the supplied header once, followed by new rows. For a nonempty unterminated tail insert exactly one LF before new rows. With no new rows return existing text unchanged.

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
no new	`"a,b\n"`	`"a,b"`	Failed

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