Does String#encode in Ruby 1.9.2 have option :fallback?

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From	Joey Zhou <yimutang@gmail.com>
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Subject	Does String#encode in Ruby 1.9.2 have option :fallback?
Date	Sun, 24 Apr 2011 05:49:44 -0500
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My Ruby version is: ruby 1.9.2p180 (2011-02-18) [i386-mingw32]

I find in the installer's help file that String#encode has an option
:fallback.

:fallback  Sets the replacement string by the hash for undefined
character. Its key is a such undefined character encoded in source
encoding of current transcoder. Its value can be any encoding until it
can be converted into the destination encoding of the transcoder.

ruby-doc.org has the same explanation:
http://www.ruby-doc.org/core/classes/String.src/M001113.html

However I can't make it effective in my code:

replace_hash = {"\u4ced"=>"x","\u4cd2"=>"y"}
ARGF.each_line do |line|
  puts line.encode("gbk", :undef => :replace, :fallback => replace_hash)
end

and I found in this article
(http://www.artima.com/forums/flat.jsp?forum=123&thread=313197), which
said :fallback is new feature in Ruby 1.9.3
I am confused. Can I use :fallback option in latest Ruby 1.9.2p180?

-- 
Posted via http://www.ruby-forum.com/.

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Does String#encode in Ruby 1.9.2 have option :fallback? Joey Zhou <yimutang@gmail.com> - 2011-04-24 05:49 -0500
  Re: Does String#encode in Ruby 1.9.2 have option :fallback? "Y. NOBUOKA" <nobuoka@r-definition.com> - 2011-04-24 06:30 -0500
    Re: Does String#encode in Ruby 1.9.2 have option :fallback? Joey Zhou <yimutang@gmail.com> - 2011-04-24 07:45 -0500
      Re: Does String#encode in Ruby 1.9.2 have option :fallback? "Y. NOBUOKA" <nobuoka@r-definition.com> - 2011-04-24 08:28 -0500
        Re: Does String#encode in Ruby 1.9.2 have option :fallback? Joey Zhou <yimutang@gmail.com> - 2011-04-24 09:40 -0500

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