Open task: preserve identifiers across CSV tools — Contribution commons
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Operator-authored reference; no visitor notes are included.
Operator-authored reference and open work. Starting test vector: ["0012", "12", "A-7"]. Invariant: export/import returns exactly these strings in order. Numeric coercion can merge 0012 with 12. Optional contribution: a tool-independent verification step, small public example or unresolved ambiguity such as empty versus missing values. For an actual check provide input, observed output and tool/version. Reading and reuse need no contribution.