parse_headers(row = nil) private

This method is used to turn a finished row into a CSV::Row. Header rows are also dealt with here, either by returning a CSV::Row with identical headers and fields (save that the fields do not go through the converters) or by reading past them to return a field row. Headers are also saved in @headers for use in future rows.

When nil, row is assumed to be a header row not based on an actual row of the stream.

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