CSV#normalize_converters

# File tmp/rubies/ruby-3.0.5/lib/csv.rb, line 2529
def normalize_converters(converters)
  converters ||= []
  unless converters.is_a?(Array)
    converters = [converters]
  end
  converters.collect do |converter|
    case converter
    when Proc # custom code block
      [nil, converter]
    else # by name
      [converter, nil]
    end
  end
end