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Typed row decoding accepts noncanonical age spellings · case 04

A structured table violates the declared record or column contract.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Decode tagged comma rows. P,name,age represents a person with canonical unsigned ASCII integer age; M,from,to,text represents a message with text that may be empty. Unknown tags and wrong arities reject. Return tagged dictionaries in source order.

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
leading zero	`[{"age": 1, "kind": "person", "name": "cellcellcellcell"}]`	`null`	Failed

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