--- Iconv.new(to, from) {|cd| ...}
    from  to ؤοѴꡢ֤ޤ

    to  from ѴѴʸ粽ηϤǤ

    Υ᥽åɤ㳰ϼ̤Ǥ

    to  from  String ǤʤȤ TypeError

    to  from ǻꤵ줿Ѵ郎ĤʤȤ
    ArgumentError

    iconv_open(3) ԤȤSystemCallError

