CSV::Writer#prepare_force_quotes_fields

# File tmp/rubies/ruby-3.1.3/lib/csv/writer.rb, line 106
def prepare_force_quotes_fields(force_quotes)
  @force_quotes_fields = {}
  force_quotes.each do |name_or_index|
    case name_or_index
    when Integer
      index = name_or_index
      @force_quotes_fields[index] = true
    when String, Symbol
      name = name_or_index.to_s
      if @headers.nil?
        message = ":headers is required when you use field name " +
                  "in :force_quotes: " +
                  "#{name_or_index.inspect}: #{force_quotes.inspect}"
        raise ArgumentError, message
      end
      index = @headers.index(name)
      next if index.nil?
      @force_quotes_fields[index] = true
    else
      message = ":force_quotes element must be " +
                "field index or field name: " +
                "#{name_or_index.inspect}: #{force_quotes.inspect}"
      raise ArgumentError, message
    end
  end
end