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All the Perl that's Practical to Extract and Report

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    1. No contest: column_names.

    2. Definitely no rewinding magic. In fact, I wouldn’t even include a column_names_from_line sugar method, because all it does is save five keystrokes on a rare operation for the price of concealing how that works. And that’s the only reason users might forget about having to call that method first thing.

      If you just tell them that they need to set up the column names manually (and here’s an easy way to take them from the first line of the file), then it’s p