CSV::Writer#quote_field

# File tmp/rubies/ruby-3.3.0/lib/csv/writer.rb, line 181
def quote_field(field)
  field = String(field)
  encoded_quote_character = @quote_character.encode(field.encoding)
  encoded_quote_character +
    field.gsub(encoded_quote_character,
               encoded_quote_character * 2) +
    encoded_quote_character
end