petl-developers / petl / 42635177120

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Fix unpack header alignment for duplicate field names (#793)

This keeps `unpack()` headers aligned with their row values when a
positional selector chooses a repeated field name.

For example, unpacking column `2` in `['item', 'keep', 'item']`
currently produces `['keep', 'item', 'x', 'y']`, although the surviving
row values are still `['left', 'middle', 'a', 'b']`. This change
produces `['item', 'keep', 'x', 'y']`, preserving the correct
field-to-value mapping.

Closes #792

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